diff --git a/env/env_encryption.cc b/env/env_encryption.cc
index 97c7439c4..4a2b68bc7 100644
--- a/env/env_encryption.cc
+++ b/env/env_encryption.cc
@@ -1274,10 +1274,10 @@ static void RegisterEncryptionBuiltins() {
   static std::once_flag once;
   std::call_once(once, [&]() {
     auto lib = ObjectRegistry::Default()->AddLibrary("encryption");
-    std::string ctr =
-        std::string(CTREncryptionProvider::kClassName()) + "?(://test)";
+    // Match "CTR" or "CTR://test"
     lib->Register<EncryptionProvider>(
-        std::string(CTREncryptionProvider::kClassName()) + "(://test)?",
+        ObjectLibrary::PatternEntry(CTREncryptionProvider::kClassName(), true)
+            .AddSuffix("://test"),
         [](const std::string& uri, std::unique_ptr<EncryptionProvider>* guard,
            std::string* /*errmsg*/) {
           if (EndsWith(uri, "://test")) {
@@ -1300,8 +1300,10 @@ static void RegisterEncryptionBuiltins() {
           return guard->get();
         });
 
+    // Match "ROT13" or "ROT13:[0-9]+"
     lib->Register<BlockCipher>(
-        std::string(ROT13BlockCipher::kClassName()) + "(:.*)?",
+        ObjectLibrary::PatternEntry(ROT13BlockCipher::kClassName(), true)
+            .AddNumber(":"),
         [](const std::string& uri, std::unique_ptr<BlockCipher>* guard,
            std::string* /* errmsg */) {
           size_t colon = uri.find(':');
diff --git a/include/rocksdb/utilities/object_registry.h b/include/rocksdb/utilities/object_registry.h
index b21868709..bc7d7ce3f 100644
--- a/include/rocksdb/utilities/object_registry.h
+++ b/include/rocksdb/utilities/object_registry.h
@@ -16,7 +16,6 @@
 #include <vector>
 
 #include "rocksdb/status.h"
-#include "rocksdb/utilities/regex.h"
 
 namespace ROCKSDB_NAMESPACE {
 class Customizable;
@@ -43,58 +42,158 @@ using ConfigureFunc = std::function<Status(T*)>;
 
 class ObjectLibrary {
  public:
+  // Class for matching target strings to a pattern.
+  // Entries consist of a name that starts the pattern and attributes
+  // The following attributes can be added to the entry:
+  //   -Suffix: Comparable to name(suffix)
+  //   -Separator: Comparable to name(separator).+
+  //   -Number: Comparable to name(separator).[0-9]+
+  //   -AltName: Comparable to (name|alt)
+  //   -Optional: Comparable to name(separator)?
+  // Multiple separators can be combined and cause multiple matches.
+  // For example, Pattern("A").AnotherName("B"),AddSeparator("@").AddNumber("#")
+  // is roughly equivalent to "(A|B)@.+#.+"
+  //
+  // Note that though this class does provide some regex-style matching,
+  // it is not a full regex parser and has some key differences:
+  //   - Separators are matched left-most.  For example, an entry
+  //     Name("Hello").AddSeparator(" ").AddSuffix("!") would match
+  //     "Hello world!", but not "Hello world!!"
+  //   - No backtracking is necessary, enabling reliably efficient matching
+  class PatternEntry {
+   private:
+    enum Quantifier {
+      kMatchPattern,  // [suffix].+
+      kMatchExact,    // [suffix]
+      kMatchNumeric,  // [suffix][0-9]+
+    };
+
+   public:
+    // Short-cut for creating an entry that matches to a
+    // Customizable::IndividualId
+    static PatternEntry AsIndividualId(const std::string& name) {
+      PatternEntry entry(name, true);
+      entry.AddSeparator("@");
+      entry.AddSeparator("#");
+      return entry;
+    }
+
+    // Creates a new pattern entry for "name".  If optional is true,
+    // Matches will also return true if name==target
+    explicit PatternEntry(const std::string& name, bool optional = true)
+        : name_(name), optional_(optional), slength_(0) {
+      nlength_ = name_.size();
+    }
+
+    // Adds a suffix (exact match of separator with no trailing characters) to
+    // the separator
+    PatternEntry& AddSuffix(const std::string& suffix) {
+      separators_.emplace_back(suffix, kMatchExact);
+      slength_ += suffix.size();
+      return *this;
+    }
+
+    // Adds a separator (exact match of separator with trailing characters) to
+    // the entry
+    PatternEntry& AddSeparator(const std::string& separator) {
+      separators_.emplace_back(separator, kMatchPattern);
+      slength_ += separator.size() + 1;
+      return *this;
+    }
+
+    // Adds a separator (exact match of separator with trailing numbers) to the
+    // entry
+    PatternEntry& AddNumber(const std::string& separator) {
+      separators_.emplace_back(separator, kMatchNumeric);
+      slength_ += separator.size() + 1;
+      return *this;
+    }
+
+    // Sets another name that this entry will match, similar to (name|alt)
+    PatternEntry& AnotherName(const std::string& alt) {
+      names_.emplace_back(alt);
+      return *this;
+    }
+
+    // Sets whether the separators are required -- similar to name(separator)?
+    // If optional is true, then name(separator)? would match
+    // If optional is false, then the separators must also match
+    PatternEntry& SetOptional(bool optional) {
+      optional_ = optional;
+      return *this;
+    }
+
+    // Checks to see if the target matches this entry
+    bool Matches(const std::string& target) const;
+    const char* Name() const { return name_.c_str(); }
+
+   private:
+    size_t MatchSeparatorAt(size_t start, Quantifier mode,
+                            const std::string& target, size_t tlen,
+                            const std::string& pattern) const;
+
+    bool MatchesTarget(const std::string& name, size_t nlen,
+                       const std::string& target, size_t ylen) const;
+    std::string name_;                // The base name for this entry
+    size_t nlength_;                  // The length of name_
+    std::vector<std::string> names_;  // Alternative names for this entry
+    bool optional_;   // Whether matching of separators is required
+    size_t slength_;  // The minimum required length to match the separators
+    std::vector<std::pair<std::string, Quantifier>>
+        separators_;  // What to match
+  };                  // End class Entry
+
+ private:
   // Base class for an Entry in the Registry.
   class Entry {
    public:
     virtual ~Entry() {}
-    Entry(const std::string& name) : name_(std::move(name)) {}
-
-    // Checks to see if the target matches this entry
-    virtual bool matches(const std::string& target) const {
-      return name_ == target;
-    }
-    const std::string& Name() const { return name_; }
-
-   private:
-    const std::string name_;  // The name of the Entry
-  };                          // End class Entry
+    virtual bool Matches(const std::string& target) const = 0;
+    virtual const char* Name() const = 0;
+  };
 
   // An Entry containing a FactoryFunc for creating new Objects
-  //
-  // !!!!!! WARNING !!!!!!: The implementation currently uses std::regex, which
-  // has terrible performance in some cases, including possible crash due to
-  // stack overflow. See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61582
-  // for example. Avoid complicated regexes as much as possible.
   template <typename T>
   class FactoryEntry : public Entry {
    public:
-    FactoryEntry(const std::string& name, FactoryFunc<T> f)
-        : Entry(name), factory_(std::move(f)) {
-      // FIXME: the API needs to expose this failure mode. For now, bad regexes
-      // will match nothing.
-      Regex::Parse(name, &regex_).PermitUncheckedError();
-    }
-    ~FactoryEntry() override {}
-    bool matches(const std::string& target) const override {
-      return regex_.Matches(target);
+    FactoryEntry(const PatternEntry& e, FactoryFunc<T> f)
+        : entry_(e), factory_(std::move(f)) {}
+    bool Matches(const std::string& target) const override {
+      return entry_.Matches(target);
     }
+    const char* Name() const override { return entry_.Name(); }
+
     // Creates a new T object.
     T* NewFactoryObject(const std::string& target, std::unique_ptr<T>* guard,
                         std::string* msg) const {
       return factory_(target, guard, msg);
     }
+    const FactoryFunc<T>& GetFactory() const { return factory_; }
 
    private:
-    Regex regex_;  // The pattern for this entry
+    PatternEntry entry_;  // The pattern for this entry
     FactoryFunc<T> factory_;
   };  // End class FactoryEntry
  public:
   explicit ObjectLibrary(const std::string& id) { id_ = id; }
 
   const std::string& GetID() const { return id_; }
-  // Finds the entry matching the input name and type
-  const Entry* FindEntry(const std::string& type,
-                         const std::string& name) const;
+
+  template <typename T>
+  FactoryFunc<T> FindFactory(const std::string& pattern) const {
+    std::unique_lock<std::mutex> lock(mu_);
+    auto factories = factories_.find(T::Type());
+    if (factories != factories_.end()) {
+      for (const auto& e : factories->second) {
+        if (e->Matches(pattern)) {
+          const auto* fe =
+              static_cast<const ObjectLibrary::FactoryEntry<T>*>(e.get());
+          return fe->GetFactory();
+        }
+      }
+    }
+    return nullptr;
+  }
 
   // Returns the total number of factories registered for this library.
   // This method returns the sum of all factories registered for all types.
@@ -108,9 +207,18 @@ class ObjectLibrary {
   template <typename T>
   const FactoryFunc<T>& Register(const std::string& pattern,
                                  const FactoryFunc<T>& factory) {
-    std::unique_ptr<Entry> entry(new FactoryEntry<T>(pattern, factory));
-    AddEntry(T::Type(), entry);
-    return factory;
+    PatternEntry entry(pattern);
+    return Register(entry, factory);
+  }
+
+  template <typename T>
+  const FactoryFunc<T>& Register(const PatternEntry& pattern,
+                                 const FactoryFunc<T>& func) {
+    std::unique_ptr<Entry> entry(new FactoryEntry<T>(pattern, func));
+    std::unique_lock<std::mutex> lock(mu_);
+    auto& factories = factories_[T::Type()];
+    factories.emplace_back(std::move(entry));
+    return func;
   }
 
   // Invokes the registrar function with the supplied arg for this library.
@@ -122,13 +230,11 @@ class ObjectLibrary {
   static std::shared_ptr<ObjectLibrary>& Default();
 
  private:
-  // Adds the input entry to the list for the given type
-  void AddEntry(const std::string& type, std::unique_ptr<Entry>& entry);
-
   // Protects the entry map
   mutable std::mutex mu_;
   // ** FactoryFunctions for this loader, organized by type
-  std::unordered_map<std::string, std::vector<std::unique_ptr<Entry>>> entries_;
+  std::unordered_map<std::string, std::vector<std::unique_ptr<Entry>>>
+      factories_;
 
   // The name for this library
   std::string id_;
@@ -178,11 +284,9 @@ class ObjectRegistry {
   T* NewObject(const std::string& target, std::unique_ptr<T>* guard,
                std::string* errmsg) {
     guard->reset();
-    const auto* basic = FindEntry(T::Type(), target);
-    if (basic != nullptr) {
-      const auto* factory =
-          static_cast<const ObjectLibrary::FactoryEntry<T>*>(basic);
-      return factory->NewFactoryObject(target, guard, errmsg);
+    auto factory = FindFactory<T>(target);
+    if (factory != nullptr) {
+      return factory(target, guard, errmsg);
     } else {
       *errmsg = std::string("Could not load ") + T::Type();
       return nullptr;
@@ -386,8 +490,27 @@ class ObjectRegistry {
   Status SetManagedObject(const std::string& type, const std::string& id,
                           const std::shared_ptr<Customizable>& c);
 
-  const ObjectLibrary::Entry* FindEntry(const std::string& type,
-                                        const std::string& name) const;
+  // Searches (from back to front) the libraries looking for the
+  // factory that matches this pattern.
+  // Returns the factory if it is found, and nullptr otherwise
+  template <typename T>
+  const FactoryFunc<T> FindFactory(const std::string& name) const {
+    {
+      std::unique_lock<std::mutex> lock(library_mutex_);
+      for (auto iter = libraries_.crbegin(); iter != libraries_.crend();
+           ++iter) {
+        const auto factory = iter->get()->FindFactory<T>(name);
+        if (factory != nullptr) {
+          return factory;
+        }
+      }
+    }
+    if (parent_ != nullptr) {
+      return parent_->FindFactory<T>(name);
+    } else {
+      return nullptr;
+    }
+  }
 
   // The set of libraries to search for factories for this registry.
   // The libraries are searched in reverse order (back to front) when
diff --git a/options/customizable_test.cc b/options/customizable_test.cc
index f4872ad9d..ea6e73fb2 100644
--- a/options/customizable_test.cc
+++ b/options/customizable_test.cc
@@ -41,6 +41,10 @@
 #include "util/string_util.h"
 #include "utilities/compaction_filters/remove_emptyvalue_compactionfilter.h"
 #include "utilities/memory_allocators.h"
+#include "utilities/merge_operators/bytesxor.h"
+#include "utilities/merge_operators/sortlist.h"
+#include "utilities/merge_operators/string_append/stringappend.h"
+#include "utilities/merge_operators/string_append/stringappend2.h"
 
 #ifndef GFLAGS
 bool FLAGS_enable_print = false;
@@ -177,7 +181,7 @@ static int A_count = 0;
 static int RegisterCustomTestObjects(ObjectLibrary& library,
                                      const std::string& /*arg*/) {
   library.Register<TestCustomizable>(
-      "A.*",
+      ObjectLibrary::PatternEntry("A", true).AddSeparator("_"),
       [](const std::string& name, std::unique_ptr<TestCustomizable>* guard,
          std::string* /* msg */) {
         guard->reset(new ACustomizable(name));
@@ -322,7 +326,7 @@ class CustomizableTest : public testing::Test {
 //    - a property with a name
 TEST_F(CustomizableTest, CreateByNameTest) {
   ObjectLibrary::Default()->Register<TestCustomizable>(
-      "TEST.*",
+      ObjectLibrary::PatternEntry("TEST", false).AddSeparator("_"),
       [](const std::string& name, std::unique_ptr<TestCustomizable>* guard,
          std::string* /* msg */) {
         guard->reset(new TestCustomizable(name));
@@ -931,12 +935,12 @@ TEST_F(CustomizableTest, NoNameTest) {
   auto copts = copy.GetOptions<SimpleOptions>();
   sopts->cu.reset(new ACustomizable(""));
   orig.cv.push_back(std::make_shared<ACustomizable>(""));
-  orig.cv.push_back(std::make_shared<ACustomizable>("A1"));
+  orig.cv.push_back(std::make_shared<ACustomizable>("A_1"));
   std::string opt_str, mismatch;
   ASSERT_OK(orig.GetOptionString(config_options_, &opt_str));
   ASSERT_OK(copy.ConfigureFromString(config_options_, opt_str));
   ASSERT_EQ(copy.cv.size(), 1U);
-  ASSERT_EQ(copy.cv[0]->GetId(), "A1");
+  ASSERT_EQ(copy.cv[0]->GetId(), "A_1");
   ASSERT_EQ(copts->cu, nullptr);
 }
 
@@ -1016,19 +1020,27 @@ TEST_F(CustomizableTest, FactoryFunctionTest) {
 
 TEST_F(CustomizableTest, URLFactoryTest) {
   std::unique_ptr<TestCustomizable> unique;
+  config_options_.registry->AddLibrary("URL")->Register<TestCustomizable>(
+      ObjectLibrary::PatternEntry("Z", false).AddSeparator(""),
+      [](const std::string& name, std::unique_ptr<TestCustomizable>* guard,
+         std::string* /* msg */) {
+        guard->reset(new TestCustomizable(name));
+        return guard->get();
+      });
+
   ConfigOptions ignore = config_options_;
   ignore.ignore_unsupported_options = false;
   ignore.ignore_unsupported_options = false;
-  ASSERT_OK(TestCustomizable::CreateFromString(ignore, "A=1;x=y", &unique));
+  ASSERT_OK(TestCustomizable::CreateFromString(ignore, "Z=1;x=y", &unique));
   ASSERT_NE(unique, nullptr);
-  ASSERT_EQ(unique->GetId(), "A=1;x=y");
-  ASSERT_OK(TestCustomizable::CreateFromString(ignore, "A;x=y", &unique));
+  ASSERT_EQ(unique->GetId(), "Z=1;x=y");
+  ASSERT_OK(TestCustomizable::CreateFromString(ignore, "Z;x=y", &unique));
   ASSERT_NE(unique, nullptr);
-  ASSERT_EQ(unique->GetId(), "A;x=y");
+  ASSERT_EQ(unique->GetId(), "Z;x=y");
   unique.reset();
-  ASSERT_OK(TestCustomizable::CreateFromString(ignore, "A=1?x=y", &unique));
+  ASSERT_OK(TestCustomizable::CreateFromString(ignore, "Z=1?x=y", &unique));
   ASSERT_NE(unique, nullptr);
-  ASSERT_EQ(unique->GetId(), "A=1?x=y");
+  ASSERT_EQ(unique->GetId(), "Z=1?x=y");
 }
 
 TEST_F(CustomizableTest, MutableOptionsTest) {
@@ -1126,6 +1138,7 @@ TEST_F(CustomizableTest, CustomManagedObjects) {
   std::shared_ptr<TestCustomizable> object1, object2;
   ASSERT_OK(LoadManagedObject<TestCustomizable>(
       config_options_, "id=A_1;int=1;bool=true", &object1));
+  ASSERT_NE(object1, nullptr);
   ASSERT_OK(
       LoadManagedObject<TestCustomizable>(config_options_, "A_1", &object2));
   ASSERT_EQ(object1, object2);
@@ -1165,9 +1178,11 @@ TEST_F(CustomizableTest, CreateManagedObjects) {
 
   config_options_.registry->AddLibrary("Managed")
       ->Register<ManagedCustomizable>(
-          "Managed(@.*)?", [](const std::string& /*name*/,
-                              std::unique_ptr<ManagedCustomizable>* guard,
-                              std::string* /* msg */) {
+          ObjectLibrary::PatternEntry::AsIndividualId(
+              ManagedCustomizable::kClassName()),
+          [](const std::string& /*name*/,
+             std::unique_ptr<ManagedCustomizable>* guard,
+             std::string* /* msg */) {
             guard->reset(new ManagedCustomizable());
             return guard->get();
           });
@@ -1317,7 +1332,8 @@ class MockMemoryAllocator : public BaseMemoryAllocator {
 class MockEncryptionProvider : public EncryptionProvider {
  public:
   explicit MockEncryptionProvider(const std::string& id) : id_(id) {}
-  const char* Name() const override { return "Mock"; }
+  static const char* kClassName() { return "Mock"; }
+  const char* Name() const override { return kClassName(); }
   size_t GetPrefixLength() const override { return 0; }
   Status CreateNewPrefix(const std::string& /*fname*/, char* /*prefix*/,
                          size_t /*prefixLength*/) const override {
@@ -1459,7 +1475,8 @@ static int RegisterLocalObjects(ObjectLibrary& library,
       });
 
   library.Register<EncryptionProvider>(
-      "Mock(://test)?",
+      ObjectLibrary::PatternEntry(MockEncryptionProvider::kClassName(), true)
+          .AddSuffix("://test"),
       [](const std::string& uri, std::unique_ptr<EncryptionProvider>* guard,
          std::string* /* errmsg */) {
         guard->reset(new MockEncryptionProvider(uri));
@@ -1811,9 +1828,74 @@ TEST_F(LoadCustomizableTest, LoadMergeOperatorTest) {
 
   ASSERT_NOK(
       MergeOperator::CreateFromString(config_options_, "Changling", &result));
+  //**TODO: MJR: Use the constants when these names are in public classes
   ASSERT_OK(MergeOperator::CreateFromString(config_options_, "put", &result));
   ASSERT_NE(result, nullptr);
   ASSERT_STREQ(result->Name(), "PutOperator");
+  ASSERT_OK(
+      MergeOperator::CreateFromString(config_options_, "PutOperator", &result));
+  ASSERT_NE(result, nullptr);
+  ASSERT_STREQ(result->Name(), "PutOperator");
+  ASSERT_OK(
+      MergeOperator::CreateFromString(config_options_, "put_v1", &result));
+  ASSERT_NE(result, nullptr);
+  ASSERT_STREQ(result->Name(), "PutOperator");
+
+  ASSERT_OK(
+      MergeOperator::CreateFromString(config_options_, "uint64add", &result));
+  ASSERT_NE(result, nullptr);
+  ASSERT_STREQ(result->Name(), "UInt64AddOperator");
+  ASSERT_OK(MergeOperator::CreateFromString(config_options_,
+                                            "UInt64AddOperator", &result));
+  ASSERT_NE(result, nullptr);
+  ASSERT_STREQ(result->Name(), "UInt64AddOperator");
+
+  ASSERT_OK(MergeOperator::CreateFromString(config_options_, "max", &result));
+  ASSERT_NE(result, nullptr);
+  ASSERT_STREQ(result->Name(), "MaxOperator");
+  ASSERT_OK(
+      MergeOperator::CreateFromString(config_options_, "MaxOperator", &result));
+  ASSERT_NE(result, nullptr);
+  ASSERT_STREQ(result->Name(), "MaxOperator");
+#ifndef ROCKSDB_LITE
+  ASSERT_OK(MergeOperator::CreateFromString(
+      config_options_, StringAppendOperator::kNickName(), &result));
+  ASSERT_NE(result, nullptr);
+  ASSERT_STREQ(result->Name(), StringAppendOperator::kClassName());
+  ASSERT_OK(MergeOperator::CreateFromString(
+      config_options_, StringAppendOperator::kClassName(), &result));
+  ASSERT_NE(result, nullptr);
+  ASSERT_STREQ(result->Name(), StringAppendOperator::kClassName());
+
+  ASSERT_OK(MergeOperator::CreateFromString(
+      config_options_, StringAppendTESTOperator::kNickName(), &result));
+  ASSERT_NE(result, nullptr);
+  ASSERT_STREQ(result->Name(), StringAppendTESTOperator::kClassName());
+  ASSERT_OK(MergeOperator::CreateFromString(
+      config_options_, StringAppendTESTOperator::kClassName(), &result));
+  ASSERT_NE(result, nullptr);
+  ASSERT_STREQ(result->Name(), StringAppendTESTOperator::kClassName());
+
+  ASSERT_OK(MergeOperator::CreateFromString(config_options_,
+                                            SortList::kNickName(), &result));
+  ASSERT_NE(result, nullptr);
+  ASSERT_STREQ(result->Name(), SortList::kClassName());
+  ASSERT_OK(MergeOperator::CreateFromString(config_options_,
+                                            SortList::kClassName(), &result));
+  ASSERT_NE(result, nullptr);
+  ASSERT_STREQ(result->Name(), SortList::kClassName());
+
+  ASSERT_OK(MergeOperator::CreateFromString(
+      config_options_, BytesXOROperator::kNickName(), &result));
+  ASSERT_NE(result, nullptr);
+  ASSERT_STREQ(result->Name(), BytesXOROperator::kClassName());
+  ASSERT_OK(MergeOperator::CreateFromString(
+      config_options_, BytesXOROperator::kClassName(), &result));
+  ASSERT_NE(result, nullptr);
+  ASSERT_STREQ(result->Name(), BytesXOROperator::kClassName());
+#endif  // ROCKSDB_LITE
+  ASSERT_NOK(
+      MergeOperator::CreateFromString(config_options_, "Changling", &result));
   if (RegisterTests("Test")) {
     ASSERT_OK(
         MergeOperator::CreateFromString(config_options_, "Changling", &result));
diff --git a/options/options_test.cc b/options/options_test.cc
index 0392320a8..36e538dc5 100644
--- a/options/options_test.cc
+++ b/options/options_test.cc
@@ -2079,8 +2079,9 @@ TEST_F(OptionsTest, OptionTablePropertiesTest) {
   // properties as the original
   cfg_opts.registry->AddLibrary("collector")
       ->Register<TablePropertiesCollectorFactory>(
-          std::string(TestTablePropertiesCollectorFactory::kClassName()) +
-              ":.*",
+          ObjectLibrary::PatternEntry(
+              TestTablePropertiesCollectorFactory::kClassName(), false)
+              .AddSeparator(":"),
           [](const std::string& name,
              std::unique_ptr<TablePropertiesCollectorFactory>* guard,
              std::string* /* errmsg */) {
diff --git a/table/plain/plain_table_factory.cc b/table/plain/plain_table_factory.cc
index 737b6b58f..a6cf42f1e 100644
--- a/table/plain/plain_table_factory.cc
+++ b/table/plain/plain_table_factory.cc
@@ -161,15 +161,14 @@ static int RegisterBuiltinMemTableRepFactory(ObjectLibrary& library,
   // The MemTableRepFactory built-in classes will be either a class
   // (VectorRepFactory) or a nickname (vector), followed optionally by ":#",
   // where # is the "size" of the factory.
-  auto AsRegex = [](const std::string& name, const std::string& alt) {
-    std::string regex;
-    regex.append("(").append(name);
-    regex.append("|").append(alt).append(")(:[0-9]*)?");
-    return regex;
+  auto AsPattern = [](const std::string& name, const std::string& alt) {
+    auto pattern = ObjectLibrary::PatternEntry(name, true);
+    pattern.AnotherName(alt);
+    pattern.AddNumber(":");
+    return pattern;
   };
-
   library.Register<MemTableRepFactory>(
-      AsRegex(VectorRepFactory::kClassName(), VectorRepFactory::kNickName()),
+      AsPattern(VectorRepFactory::kClassName(), VectorRepFactory::kNickName()),
       [](const std::string& uri, std::unique_ptr<MemTableRepFactory>* guard,
          std::string* /*errmsg*/) {
         auto colon = uri.find(":");
@@ -182,7 +181,7 @@ static int RegisterBuiltinMemTableRepFactory(ObjectLibrary& library,
         return guard->get();
       });
   library.Register<MemTableRepFactory>(
-      AsRegex(SkipListFactory::kClassName(), SkipListFactory::kNickName()),
+      AsPattern(SkipListFactory::kClassName(), SkipListFactory::kNickName()),
       [](const std::string& uri, std::unique_ptr<MemTableRepFactory>* guard,
          std::string* /*errmsg*/) {
         auto colon = uri.find(":");
@@ -195,7 +194,7 @@ static int RegisterBuiltinMemTableRepFactory(ObjectLibrary& library,
         return guard->get();
       });
   library.Register<MemTableRepFactory>(
-      AsRegex("HashLinkListRepFactory", "hash_linkedlist"),
+      AsPattern("HashLinkListRepFactory", "hash_linkedlist"),
       [](const std::string& uri, std::unique_ptr<MemTableRepFactory>* guard,
          std::string* /*errmsg*/) {
         // Expecting format: hash_linkedlist:<hash_bucket_count>
@@ -209,7 +208,7 @@ static int RegisterBuiltinMemTableRepFactory(ObjectLibrary& library,
         return guard->get();
       });
   library.Register<MemTableRepFactory>(
-      AsRegex("HashSkipListRepFactory", "prefix_hash"),
+      AsPattern("HashSkipListRepFactory", "prefix_hash"),
       [](const std::string& uri, std::unique_ptr<MemTableRepFactory>* guard,
          std::string* /*errmsg*/) {
         // Expecting format: prefix_hash:<hash_bucket_count>
@@ -230,9 +229,11 @@ static int RegisterBuiltinMemTableRepFactory(ObjectLibrary& library,
         return nullptr;
       });
 
-  return 5;
+  size_t num_types;
+  return static_cast<int>(library.GetFactoryCount(&num_types));
 }
 #endif  // ROCKSDB_LITE
+
 Status GetMemTableRepFactoryFromString(
     const std::string& opts_str, std::unique_ptr<MemTableRepFactory>* result) {
   ConfigOptions config_options;
diff --git a/test_util/testutil.cc b/test_util/testutil.cc
index 0fe789e71..07d0ef252 100644
--- a/test_util/testutil.cc
+++ b/test_util/testutil.cc
@@ -676,6 +676,25 @@ class SpecialMemTableRep : public MemTableRep {
 };
 class SpecialSkipListFactory : public MemTableRepFactory {
  public:
+#ifndef ROCKSDB_LITE
+  static bool Register(ObjectLibrary& library, const std::string& /*arg*/) {
+    library.Register<MemTableRepFactory>(
+        ObjectLibrary::PatternEntry(SpecialSkipListFactory::kClassName(), true)
+            .AddNumber(":"),
+        [](const std::string& uri, std::unique_ptr<MemTableRepFactory>* guard,
+           std::string* /* errmsg */) {
+          auto colon = uri.find(":");
+          if (colon != std::string::npos) {
+            auto count = ParseInt(uri.substr(colon + 1));
+            guard->reset(new SpecialSkipListFactory(count));
+          } else {
+            guard->reset(new SpecialSkipListFactory(2));
+          }
+          return guard->get();
+        });
+    return true;
+  }
+#endif  // ROCKSDB_LITE
   // After number of inserts exceeds `num_entries_flush` in a mem table, trigger
   // flush.
   explicit SpecialSkipListFactory(int num_entries_flush)
@@ -717,7 +736,7 @@ MemTableRepFactory* NewSpecialSkipListFactory(int num_entries_per_flush) {
 
 #ifndef ROCKSDB_LITE
 // This method loads existing test classes into the ObjectRegistry
-int RegisterTestObjects(ObjectLibrary& library, const std::string& /*arg*/) {
+int RegisterTestObjects(ObjectLibrary& library, const std::string& arg) {
   size_t num_types;
   library.Register<const Comparator>(
       test::SimpleSuffixReverseComparator::kClassName(),
@@ -727,19 +746,7 @@ int RegisterTestObjects(ObjectLibrary& library, const std::string& /*arg*/) {
         static test::SimpleSuffixReverseComparator ssrc;
         return &ssrc;
       });
-  library.Register<MemTableRepFactory>(
-      std::string(SpecialSkipListFactory::kClassName()) + "(:[0-9]*)?",
-      [](const std::string& uri, std::unique_ptr<MemTableRepFactory>* guard,
-         std::string* /* errmsg */) {
-        auto colon = uri.find(":");
-        if (colon != std::string::npos) {
-          auto count = ParseInt(uri.substr(colon + 1));
-          guard->reset(new SpecialSkipListFactory(count));
-        } else {
-          guard->reset(new SpecialSkipListFactory(2));
-        }
-        return guard->get();
-      });
+  SpecialSkipListFactory::Register(library, arg);
   library.Register<MergeOperator>(
       "Changling",
       [](const std::string& uri, std::unique_ptr<MergeOperator>* guard,
diff --git a/util/slice.cc b/util/slice.cc
index f96926cfc..268eb1b4e 100644
--- a/util/slice.cc
+++ b/util/slice.cc
@@ -143,6 +143,9 @@ const SliceTransform* NewNoopTransform() { return new NoopTransform; }
 #ifndef ROCKSDB_LITE
 static int RegisterBuiltinSliceTransform(ObjectLibrary& library,
                                          const std::string& /*arg*/) {
+  // For the builtin transforms, the format is typically
+  // [Name] or [Name].[0-9]+
+  // [NickName]:[0-9]+
   library.Register<const SliceTransform>(
       NoopTransform::kClassName(),
       [](const std::string& /*uri*/,
@@ -152,7 +155,8 @@ static int RegisterBuiltinSliceTransform(ObjectLibrary& library,
         return guard->get();
       });
   library.Register<const SliceTransform>(
-      std::string(FixedPrefixTransform::kNickName()) + ":[0-9]+",
+      ObjectLibrary::PatternEntry(FixedPrefixTransform::kNickName(), false)
+          .AddNumber(":"),
       [](const std::string& uri, std::unique_ptr<const SliceTransform>* guard,
          std::string* /*errmsg*/) {
         auto colon = uri.find(":");
@@ -161,24 +165,22 @@ static int RegisterBuiltinSliceTransform(ObjectLibrary& library,
         return guard->get();
       });
   library.Register<const SliceTransform>(
-      FixedPrefixTransform::kClassName(),
-      [](const std::string& /*uri*/,
-         std::unique_ptr<const SliceTransform>* guard,
-         std::string* /*errmsg*/) {
-        guard->reset(NewFixedPrefixTransform(0));
-        return guard->get();
-      });
-  library.Register<const SliceTransform>(
-      std::string(FixedPrefixTransform::kClassName()) + "\\.[0-9]+",
+      ObjectLibrary::PatternEntry(FixedPrefixTransform::kClassName(), true)
+          .AddNumber("."),
       [](const std::string& uri, std::unique_ptr<const SliceTransform>* guard,
          std::string* /*errmsg*/) {
-        auto len = ParseSizeT(
-            uri.substr(strlen(FixedPrefixTransform::kClassName()) + 1));
-        guard->reset(NewFixedPrefixTransform(len));
+        if (uri == FixedPrefixTransform::kClassName()) {
+          guard->reset(NewFixedPrefixTransform(0));
+        } else {
+          auto len = ParseSizeT(
+              uri.substr(strlen(FixedPrefixTransform::kClassName()) + 1));
+          guard->reset(NewFixedPrefixTransform(len));
+        }
         return guard->get();
       });
   library.Register<const SliceTransform>(
-      std::string(CappedPrefixTransform::kNickName()) + ":[0-9]+",
+      ObjectLibrary::PatternEntry(CappedPrefixTransform::kNickName(), false)
+          .AddNumber(":"),
       [](const std::string& uri, std::unique_ptr<const SliceTransform>* guard,
          std::string* /*errmsg*/) {
         auto colon = uri.find(":");
@@ -187,19 +189,21 @@ static int RegisterBuiltinSliceTransform(ObjectLibrary& library,
         return guard->get();
       });
   library.Register<const SliceTransform>(
-      std::string(CappedPrefixTransform::kClassName()) + "(\\.[0-9]+)?",
+      ObjectLibrary::PatternEntry(CappedPrefixTransform::kClassName(), true)
+          .AddNumber("."),
       [](const std::string& uri, std::unique_ptr<const SliceTransform>* guard,
          std::string* /*errmsg*/) {
         if (uri == CappedPrefixTransform::kClassName()) {
           guard->reset(NewCappedPrefixTransform(0));
-        } else {  // Length + "."
+        } else {
           auto len = ParseSizeT(
               uri.substr(strlen(CappedPrefixTransform::kClassName()) + 1));
           guard->reset(NewCappedPrefixTransform(len));
         }
         return guard->get();
       });
-  return 5;
+  size_t num_types;
+  return static_cast<int>(library.GetFactoryCount(&num_types));
 }
 #endif  // ROCKSDB_LITE
 
diff --git a/utilities/merge_operators.cc b/utilities/merge_operators.cc
index 7fe0abfaf..180e577db 100644
--- a/utilities/merge_operators.cc
+++ b/utilities/merge_operators.cc
@@ -55,38 +55,33 @@ static bool LoadMergeOperator(const std::string& id,
 static int RegisterBuiltinMergeOperators(ObjectLibrary& library,
                                          const std::string& /*arg*/) {
   size_t num_types;
-  auto AsRegex = [](const std::string& name, const std::string& alt) {
-    std::string regex;
-    regex.append("(").append(name);
-    regex.append("|").append(alt).append(")");
-    return regex;
-  };
-
   library.Register<MergeOperator>(
-      AsRegex(StringAppendOperator::kClassName(),
-              StringAppendOperator::kNickName()),
+      ObjectLibrary::PatternEntry(StringAppendOperator::kClassName())
+          .AnotherName(StringAppendOperator::kNickName()),
       [](const std::string& /*uri*/, std::unique_ptr<MergeOperator>* guard,
          std::string* /*errmsg*/) {
         guard->reset(new StringAppendOperator(","));
         return guard->get();
       });
   library.Register<MergeOperator>(
-      AsRegex(StringAppendTESTOperator::kClassName(),
-              StringAppendTESTOperator::kNickName()),
+      ObjectLibrary::PatternEntry(StringAppendTESTOperator::kClassName())
+          .AnotherName(StringAppendTESTOperator::kNickName()),
       [](const std::string& /*uri*/, std::unique_ptr<MergeOperator>* guard,
          std::string* /*errmsg*/) {
         guard->reset(new StringAppendTESTOperator(","));
         return guard->get();
       });
   library.Register<MergeOperator>(
-      AsRegex(SortList::kClassName(), SortList::kNickName()),
+      ObjectLibrary::PatternEntry(SortList::kClassName())
+          .AnotherName(SortList::kNickName()),
       [](const std::string& /*uri*/, std::unique_ptr<MergeOperator>* guard,
          std::string* /*errmsg*/) {
         guard->reset(new SortList());
         return guard->get();
       });
   library.Register<MergeOperator>(
-      AsRegex(BytesXOROperator::kClassName(), BytesXOROperator::kNickName()),
+      ObjectLibrary::PatternEntry(BytesXOROperator::kClassName())
+          .AnotherName(BytesXOROperator::kNickName()),
       [](const std::string& /*uri*/, std::unique_ptr<MergeOperator>* guard,
          std::string* /*errmsg*/) {
         guard->reset(new BytesXOROperator());
diff --git a/utilities/object_registry.cc b/utilities/object_registry.cc
index b0a60f53e..e41d3172d 100644
--- a/utilities/object_registry.cc
+++ b/utilities/object_registry.cc
@@ -5,6 +5,8 @@
 
 #include "rocksdb/utilities/object_registry.h"
 
+#include <ctype.h>
+
 #include "logging/logging.h"
 #include "rocksdb/customizable.h"
 #include "rocksdb/env.h"
@@ -12,35 +14,105 @@
 
 namespace ROCKSDB_NAMESPACE {
 #ifndef ROCKSDB_LITE
-// Looks through the "type" factories for one that matches "name".
-// If found, returns the pointer to the Entry matching this name.
-// Otherwise, nullptr is returned
-const ObjectLibrary::Entry *ObjectLibrary::FindEntry(
-    const std::string &type, const std::string &name) const {
-  std::unique_lock<std::mutex> lock(mu_);
-  auto entries = entries_.find(type);
-  if (entries != entries_.end()) {
-    for (const auto &entry : entries->second) {
-      if (entry->matches(name)) {
-        return entry.get();
+size_t ObjectLibrary::PatternEntry::MatchSeparatorAt(
+    size_t start, Quantifier mode, const std::string &target, size_t tlen,
+    const std::string &separator) const {
+  size_t slen = separator.size();
+  // See if there is enough space.  If so, find the separator
+  if (tlen < start + slen) {
+    return std::string::npos;  // not enough space left
+  } else if (mode == kMatchExact) {
+    // Exact mode means the next thing we are looking for is the separator
+    if (target.compare(start, slen, separator) != 0) {
+      return std::string::npos;
+    } else {
+      return start + slen;  // Found the separator, return where we found it
+    }
+  } else {
+    auto pos = start + 1;
+    if (!separator.empty()) {
+      pos = target.find(separator, pos);
+    }
+    if (pos == std::string::npos) {
+      return pos;
+    } else if (mode == kMatchNumeric) {
+      // If it is numeric, everything up to the match must be a number
+      while (start < pos) {
+        if (!isdigit(target[start++])) {
+          return std::string::npos;
+        }
+      }
+    }
+    return pos + slen;
+  }
+}
+
+bool ObjectLibrary::PatternEntry::MatchesTarget(const std::string &name,
+                                                size_t nlen,
+                                                const std::string &target,
+                                                size_t tlen) const {
+  if (separators_.empty()) {
+    assert(optional_);  // If there are no separators, it must be only a name
+    return nlen == tlen && name == target;
+  } else if (nlen == tlen) {  // The lengths are the same
+    return optional_ && name == target;
+  } else if (tlen < nlen + slength_) {
+    // The target is not long enough
+    return false;
+  } else if (target.compare(0, nlen, name) != 0) {
+    return false;  // Target does not start with name
+  } else {
+    // Loop through all of the separators one at a time matching them.
+    // Note that we first match the separator and then its quantifiers.
+    // Since we expect the separator first, we start with an exact match
+    // Subsequent matches will use the quantifier of the previous separator
+    size_t start = nlen;
+    auto mode = kMatchExact;
+    for (size_t idx = 0; idx < separators_.size(); ++idx) {
+      const auto &separator = separators_[idx];
+      start = MatchSeparatorAt(start, mode, target, tlen, separator.first);
+      if (start == std::string::npos) {
+        return false;
+      } else {
+        mode = separator.second;
+      }
+    }
+    // We have matched all of the separators.  Now check that what is left
+    // unmatched in the target is acceptable.
+    if (mode == kMatchExact) {
+      return (start == tlen);
+    } else if (start >= tlen) {
+      return false;
+    } else if (mode == kMatchNumeric) {
+      while (start < tlen) {
+        if (!isdigit(target[start++])) {
+          return false;
+        }
       }
     }
   }
-  return nullptr;
+  return true;
 }
 
-void ObjectLibrary::AddEntry(const std::string &type,
-                             std::unique_ptr<Entry> &entry) {
-  std::unique_lock<std::mutex> lock(mu_);
-  auto &entries = entries_[type];
-  entries.emplace_back(std::move(entry));
+bool ObjectLibrary::PatternEntry::Matches(const std::string &target) const {
+  auto tlen = target.size();
+  if (MatchesTarget(name_, nlength_, target, tlen)) {
+    return true;
+  } else if (!names_.empty()) {
+    for (const auto &alt : names_) {
+      if (MatchesTarget(alt, alt.size(), target, tlen)) {
+        return true;
+      }
+    }
+  }
+  return false;
 }
 
 size_t ObjectLibrary::GetFactoryCount(size_t *types) const {
   std::unique_lock<std::mutex> lock(mu_);
-  *types = entries_.size();
+  *types = factories_.size();
   size_t factories = 0;
-  for (const auto &e : entries_) {
+  for (const auto &e : factories_) {
     factories += e.second.size();
   }
   return factories;
@@ -48,13 +120,12 @@ size_t ObjectLibrary::GetFactoryCount(size_t *types) const {
 
 void ObjectLibrary::Dump(Logger *logger) const {
   std::unique_lock<std::mutex> lock(mu_);
-  for (const auto &iter : entries_) {
+  for (const auto &iter : factories_) {
     ROCKS_LOG_HEADER(logger, "    Registered factories for type[%s] ",
                      iter.first.c_str());
     bool printed_one = false;
     for (const auto &e : iter.second) {
-      ROCKS_LOG_HEADER(logger, "%c %s", (printed_one) ? ',' : ':',
-                       e->Name().c_str());
+      ROCKS_LOG_HEADER(logger, "%c %s", (printed_one) ? ',' : ':', e->Name());
       printed_one = true;
     }
   }
@@ -84,26 +155,6 @@ std::shared_ptr<ObjectRegistry> ObjectRegistry::NewInstance(
   return std::make_shared<ObjectRegistry>(parent);
 }
 
-// Searches (from back to front) the libraries looking for the
-// an entry that matches this pattern.
-// Returns the entry if it is found, and nullptr otherwise
-const ObjectLibrary::Entry *ObjectRegistry::FindEntry(
-    const std::string &type, const std::string &name) const {
-  {
-    std::unique_lock<std::mutex> lock(library_mutex_);
-    for (auto iter = libraries_.crbegin(); iter != libraries_.crend(); ++iter) {
-      const auto *entry = iter->get()->FindEntry(type, name);
-      if (entry != nullptr) {
-        return entry;
-      }
-    }
-  }
-  if (parent_ != nullptr) {
-    return parent_->FindEntry(type, name);
-  } else {
-    return nullptr;
-  }
-}
 Status ObjectRegistry::SetManagedObject(
     const std::string &type, const std::string &id,
     const std::shared_ptr<Customizable> &object) {
diff --git a/utilities/object_registry_test.cc b/utilities/object_registry_test.cc
index d9a5b1526..a2f61c8f6 100644
--- a/utilities/object_registry_test.cc
+++ b/utilities/object_registry_test.cc
@@ -12,32 +12,33 @@
 
 namespace ROCKSDB_NAMESPACE {
 
-class EnvRegistryTest : public testing::Test {
+class ObjRegistryTest : public testing::Test {
  public:
   static int num_a, num_b;
 };
 
-int EnvRegistryTest::num_a = 0;
-int EnvRegistryTest::num_b = 0;
+int ObjRegistryTest::num_a = 0;
+int ObjRegistryTest::num_b = 0;
 static FactoryFunc<Env> test_reg_a = ObjectLibrary::Default()->Register<Env>(
-    "a://.*",
+    ObjectLibrary::PatternEntry("a", false).AddSeparator("://"),
     [](const std::string& /*uri*/, std::unique_ptr<Env>* /*env_guard*/,
        std::string* /* errmsg */) {
-      ++EnvRegistryTest::num_a;
+      ++ObjRegistryTest::num_a;
       return Env::Default();
     });
 
 static FactoryFunc<Env> test_reg_b = ObjectLibrary::Default()->Register<Env>(
-    "b://.*", [](const std::string& /*uri*/, std::unique_ptr<Env>* env_guard,
-                 std::string* /* errmsg */) {
-      ++EnvRegistryTest::num_b;
+    ObjectLibrary::PatternEntry("b", false).AddSeparator("://"),
+    [](const std::string& /*uri*/, std::unique_ptr<Env>* env_guard,
+       std::string* /* errmsg */) {
+      ++ObjRegistryTest::num_b;
       // Env::Default() is a singleton so we can't grant ownership directly to
       // the caller - we must wrap it first.
       env_guard->reset(new EnvWrapper(Env::Default()));
       return env_guard->get();
     });
 
-TEST_F(EnvRegistryTest, Basics) {
+TEST_F(ObjRegistryTest, Basics) {
   std::string msg;
   std::unique_ptr<Env> env_guard;
   auto registry = ObjectRegistry::NewInstance();
@@ -60,7 +61,7 @@ TEST_F(EnvRegistryTest, Basics) {
   ASSERT_EQ(1, num_b);
 }
 
-TEST_F(EnvRegistryTest, LocalRegistry) {
+TEST_F(ObjRegistryTest, LocalRegistry) {
   std::string msg;
   std::unique_ptr<Env> guard;
   auto registry = ObjectRegistry::NewInstance();
@@ -87,7 +88,7 @@ TEST_F(EnvRegistryTest, LocalRegistry) {
   ASSERT_NE(registry->NewObject<Env>("test-global", &guard, &msg), nullptr);
 }
 
-TEST_F(EnvRegistryTest, CheckShared) {
+TEST_F(ObjRegistryTest, CheckShared) {
   std::shared_ptr<Env> shared;
   std::shared_ptr<ObjectRegistry> registry = ObjectRegistry::NewInstance();
   std::shared_ptr<ObjectLibrary> library =
@@ -112,7 +113,7 @@ TEST_F(EnvRegistryTest, CheckShared) {
   ASSERT_EQ(shared, nullptr);
 }
 
-TEST_F(EnvRegistryTest, CheckStatic) {
+TEST_F(ObjRegistryTest, CheckStatic) {
   Env* env = nullptr;
   std::shared_ptr<ObjectRegistry> registry = ObjectRegistry::NewInstance();
   std::shared_ptr<ObjectLibrary> library =
@@ -137,7 +138,7 @@ TEST_F(EnvRegistryTest, CheckStatic) {
   ASSERT_NE(env, nullptr);
 }
 
-TEST_F(EnvRegistryTest, CheckUnique) {
+TEST_F(ObjRegistryTest, CheckUnique) {
   std::unique_ptr<Env> unique;
   std::shared_ptr<ObjectRegistry> registry = ObjectRegistry::NewInstance();
   std::shared_ptr<ObjectLibrary> library =
@@ -162,7 +163,7 @@ TEST_F(EnvRegistryTest, CheckUnique) {
   ASSERT_EQ(unique, nullptr);
 }
 
-TEST_F(EnvRegistryTest, TestRegistryParents) {
+TEST_F(ObjRegistryTest, TestRegistryParents) {
   auto grand = ObjectRegistry::Default();
   auto parent = ObjectRegistry::NewInstance();  // parent with a grandparent
   auto uncle = ObjectRegistry::NewInstance(grand);
@@ -221,7 +222,7 @@ class MyCustomizable : public Customizable {
   std::string name_;
 };
 
-TEST_F(EnvRegistryTest, TestManagedObjects) {
+TEST_F(ObjRegistryTest, TestManagedObjects) {
   auto registry = ObjectRegistry::NewInstance();
   auto m_a1 = std::make_shared<MyCustomizable>("", "A");
   auto m_a2 = std::make_shared<MyCustomizable>("", "A");
@@ -238,7 +239,7 @@ TEST_F(EnvRegistryTest, TestManagedObjects) {
   ASSERT_EQ(registry->GetManagedObject<MyCustomizable>("A"), m_a2);
 }
 
-TEST_F(EnvRegistryTest, TestTwoManagedObjects) {
+TEST_F(ObjRegistryTest, TestTwoManagedObjects) {
   auto registry = ObjectRegistry::NewInstance();
   auto m_a = std::make_shared<MyCustomizable>("", "A");
   auto m_b = std::make_shared<MyCustomizable>("", "B");
@@ -284,7 +285,7 @@ TEST_F(EnvRegistryTest, TestTwoManagedObjects) {
   ASSERT_EQ(registry->GetManagedObject<MyCustomizable>("B"), nullptr);
 }
 
-TEST_F(EnvRegistryTest, TestAlternateNames) {
+TEST_F(ObjRegistryTest, TestAlternateNames) {
   auto registry = ObjectRegistry::NewInstance();
   auto m_a = std::make_shared<MyCustomizable>("", "A");
   auto m_b = std::make_shared<MyCustomizable>("", "B");
@@ -337,7 +338,7 @@ TEST_F(EnvRegistryTest, TestAlternateNames) {
   ASSERT_EQ(objects.size(), 0U);
 }
 
-TEST_F(EnvRegistryTest, TestTwoManagedClasses) {
+TEST_F(ObjRegistryTest, TestTwoManagedClasses) {
   class MyCustomizable2 : public MyCustomizable {
    public:
     static const char* Type() { return "MyCustomizable2"; }
@@ -377,7 +378,7 @@ TEST_F(EnvRegistryTest, TestTwoManagedClasses) {
   ASSERT_EQ(registry->GetManagedObject<MyCustomizable2>("A"), nullptr);
 }
 
-TEST_F(EnvRegistryTest, TestManagedObjectsWithParent) {
+TEST_F(ObjRegistryTest, TestManagedObjectsWithParent) {
   auto base = ObjectRegistry::NewInstance();
   auto registry = ObjectRegistry::NewInstance(base);
 
@@ -397,10 +398,10 @@ TEST_F(EnvRegistryTest, TestManagedObjectsWithParent) {
   ASSERT_EQ(registry->GetManagedObject<MyCustomizable>("A"), m_b);
 }
 
-TEST_F(EnvRegistryTest, TestGetOrCreateManagedObject) {
+TEST_F(ObjRegistryTest, TestGetOrCreateManagedObject) {
   auto registry = ObjectRegistry::NewInstance();
   registry->AddLibrary("test")->Register<MyCustomizable>(
-      "MC(@.*)?",
+      ObjectLibrary::PatternEntry::AsIndividualId("MC"),
       [](const std::string& uri, std::unique_ptr<MyCustomizable>* guard,
          std::string* /* errmsg */) {
         guard->reset(new MyCustomizable("MC", uri));
@@ -411,14 +412,14 @@ TEST_F(EnvRegistryTest, TestGetOrCreateManagedObject) {
 
   std::unordered_map<std::string, std::string> opt_map;
 
-  ASSERT_EQ(registry->GetManagedObject<MyCustomizable>("MC@A"), nullptr);
-  ASSERT_EQ(registry->GetManagedObject<MyCustomizable>("MC@B"), nullptr);
-  ASSERT_OK(registry->GetOrCreateManagedObject("MC@A", &m_a));
-  ASSERT_OK(registry->GetOrCreateManagedObject("MC@B", &m_b));
-  ASSERT_EQ(registry->GetManagedObject<MyCustomizable>("MC@A"), m_a);
-  ASSERT_OK(registry->GetOrCreateManagedObject("MC@A", &obj));
+  ASSERT_EQ(registry->GetManagedObject<MyCustomizable>("MC@A#1"), nullptr);
+  ASSERT_EQ(registry->GetManagedObject<MyCustomizable>("MC@B#1"), nullptr);
+  ASSERT_OK(registry->GetOrCreateManagedObject("MC@A#1", &m_a));
+  ASSERT_OK(registry->GetOrCreateManagedObject("MC@B#1", &m_b));
+  ASSERT_EQ(registry->GetManagedObject<MyCustomizable>("MC@A#1"), m_a);
+  ASSERT_OK(registry->GetOrCreateManagedObject("MC@A#1", &obj));
   ASSERT_EQ(obj, m_a);
-  ASSERT_OK(registry->GetOrCreateManagedObject("MC@B", &obj));
+  ASSERT_OK(registry->GetOrCreateManagedObject("MC@B#1", &obj));
   ASSERT_EQ(obj, m_b);
   ASSERT_OK(registry->ListManagedObjects(&objs));
   ASSERT_EQ(objs.size(), 2U);
@@ -426,11 +427,216 @@ TEST_F(EnvRegistryTest, TestGetOrCreateManagedObject) {
   objs.clear();
   m_a.reset();
   obj.reset();
-  ASSERT_OK(registry->GetOrCreateManagedObject("MC@A", &m_a));
+  ASSERT_OK(registry->GetOrCreateManagedObject("MC@A#1", &m_a));
   ASSERT_EQ(1, m_a.use_count());
-  ASSERT_OK(registry->GetOrCreateManagedObject("MC@B", &obj));
+  ASSERT_OK(registry->GetOrCreateManagedObject("MC@B#1", &obj));
   ASSERT_EQ(2, obj.use_count());
 }
+
+class PatternEntryTest : public testing::Test {};
+
+TEST_F(PatternEntryTest, TestSimpleEntry) {
+  ObjectLibrary::PatternEntry entry("ABC", true);
+
+  ASSERT_TRUE(entry.Matches("ABC"));
+  ASSERT_FALSE(entry.Matches("AABC"));
+  ASSERT_FALSE(entry.Matches("ABCA"));
+  ASSERT_FALSE(entry.Matches("AABCA"));
+  ASSERT_FALSE(entry.Matches("AB"));
+  ASSERT_FALSE(entry.Matches("BC"));
+  ASSERT_FALSE(entry.Matches("ABD"));
+  ASSERT_FALSE(entry.Matches("BCA"));
+}
+
+TEST_F(PatternEntryTest, TestPatternEntry) {
+  // Matches A:+
+  ObjectLibrary::PatternEntry entry("A", false);
+  entry.AddSeparator(":");
+  ASSERT_FALSE(entry.Matches("A"));
+  ASSERT_FALSE(entry.Matches("AA"));
+  ASSERT_FALSE(entry.Matches("AB"));
+  ASSERT_FALSE(entry.Matches("B"));
+  ASSERT_FALSE(entry.Matches("A:"));
+  ASSERT_FALSE(entry.Matches("AA:"));
+  ASSERT_FALSE(entry.Matches("AA:B"));
+  ASSERT_FALSE(entry.Matches("AA:BB"));
+  ASSERT_TRUE(entry.Matches("A:B"));
+  ASSERT_TRUE(entry.Matches("A:BB"));
+
+  entry.SetOptional(true);  // Now matches "A" or "A:+"
+  ASSERT_TRUE(entry.Matches("A"));
+  ASSERT_FALSE(entry.Matches("AA"));
+  ASSERT_FALSE(entry.Matches("AB"));
+  ASSERT_FALSE(entry.Matches("B"));
+  ASSERT_FALSE(entry.Matches("A:"));
+  ASSERT_FALSE(entry.Matches("AA:"));
+  ASSERT_FALSE(entry.Matches("AA:B"));
+  ASSERT_FALSE(entry.Matches("AA:BB"));
+  ASSERT_TRUE(entry.Matches("A:B"));
+  ASSERT_TRUE(entry.Matches("A:BB"));
+}
+
+TEST_F(PatternEntryTest, TestSuffixEntry) {
+  ObjectLibrary::PatternEntry entry("AA", true);
+  entry.AddSuffix("BB");
+
+  ASSERT_TRUE(entry.Matches("AA"));
+  ASSERT_TRUE(entry.Matches("AABB"));
+
+  ASSERT_FALSE(entry.Matches("A"));
+  ASSERT_FALSE(entry.Matches("AB"));
+  ASSERT_FALSE(entry.Matches("B"));
+  ASSERT_FALSE(entry.Matches("BB"));
+  ASSERT_FALSE(entry.Matches("ABA"));
+  ASSERT_FALSE(entry.Matches("BBAA"));
+  ASSERT_FALSE(entry.Matches("AABBA"));
+  ASSERT_FALSE(entry.Matches("AABBB"));
+}
+
+TEST_F(PatternEntryTest, TestNumericEntry) {
+  ObjectLibrary::PatternEntry entry("A", false);
+  entry.AddNumber(":");
+  ASSERT_FALSE(entry.Matches("A"));
+  ASSERT_FALSE(entry.Matches("AA"));
+  ASSERT_FALSE(entry.Matches("A:"));
+  ASSERT_FALSE(entry.Matches("AA:"));
+  ASSERT_TRUE(entry.Matches("A:1"));
+  ASSERT_TRUE(entry.Matches("A:11"));
+  ASSERT_FALSE(entry.Matches("AA:1"));
+  ASSERT_FALSE(entry.Matches("AA:11"));
+  ASSERT_FALSE(entry.Matches("A:B"));
+  ASSERT_FALSE(entry.Matches("A:1B"));
+  ASSERT_FALSE(entry.Matches("A:B1"));
+}
+
+TEST_F(PatternEntryTest, TestIndividualIdEntry) {
+  auto entry = ObjectLibrary::PatternEntry::AsIndividualId("AA");
+  ASSERT_TRUE(entry.Matches("AA"));
+  ASSERT_TRUE(entry.Matches("AA@123#456"));
+  ASSERT_TRUE(entry.Matches("AA@deadbeef#id"));
+
+  ASSERT_FALSE(entry.Matches("A"));
+  ASSERT_FALSE(entry.Matches("AAA"));
+  ASSERT_FALSE(entry.Matches("AA@123"));
+  ASSERT_FALSE(entry.Matches("AA@123#"));
+  ASSERT_FALSE(entry.Matches("AA@#123"));
+}
+
+TEST_F(PatternEntryTest, TestTwoNameEntry) {
+  ObjectLibrary::PatternEntry entry("A");
+  entry.AnotherName("B");
+  ASSERT_TRUE(entry.Matches("A"));
+  ASSERT_TRUE(entry.Matches("B"));
+  ASSERT_FALSE(entry.Matches("AA"));
+  ASSERT_FALSE(entry.Matches("BB"));
+  ASSERT_FALSE(entry.Matches("AA"));
+  ASSERT_FALSE(entry.Matches("BA"));
+  ASSERT_FALSE(entry.Matches("AB"));
+}
+
+TEST_F(PatternEntryTest, TestTwoPatternEntry) {
+  ObjectLibrary::PatternEntry entry("AA", false);
+  entry.AddSeparator(":");
+  entry.AddSeparator(":");
+  ASSERT_FALSE(entry.Matches("AA"));
+  ASSERT_FALSE(entry.Matches("AA:"));
+  ASSERT_FALSE(entry.Matches("AA::"));
+  ASSERT_FALSE(entry.Matches("AA::12"));
+  ASSERT_TRUE(entry.Matches("AA:1:2"));
+  ASSERT_TRUE(entry.Matches("AA:1:2:"));
+
+  ObjectLibrary::PatternEntry entry2("AA", false);
+  entry2.AddSeparator("::");
+  entry2.AddSeparator("##");
+  ASSERT_FALSE(entry2.Matches("AA"));
+  ASSERT_FALSE(entry2.Matches("AA:"));
+  ASSERT_FALSE(entry2.Matches("AA::"));
+  ASSERT_FALSE(entry2.Matches("AA::#"));
+  ASSERT_FALSE(entry2.Matches("AA::##"));
+  ASSERT_FALSE(entry2.Matches("AA##1::2"));
+  ASSERT_FALSE(entry2.Matches("AA::123##"));
+  ASSERT_TRUE(entry2.Matches("AA::1##2"));
+  ASSERT_TRUE(entry2.Matches("AA::12##34:"));
+  ASSERT_TRUE(entry2.Matches("AA::12::34##56"));
+  ASSERT_TRUE(entry2.Matches("AA::12##34::56"));
+}
+
+TEST_F(PatternEntryTest, TestTwoNumbersEntry) {
+  ObjectLibrary::PatternEntry entry("AA", false);
+  entry.AddNumber(":");
+  entry.AddNumber(":");
+  ASSERT_FALSE(entry.Matches("AA"));
+  ASSERT_FALSE(entry.Matches("AA:"));
+  ASSERT_FALSE(entry.Matches("AA::"));
+  ASSERT_FALSE(entry.Matches("AA::12"));
+  ASSERT_FALSE(entry.Matches("AA:1:2:"));
+  ASSERT_TRUE(entry.Matches("AA:1:2"));
+  ASSERT_TRUE(entry.Matches("AA:12:23456"));
+
+  ObjectLibrary::PatternEntry entry2("AA", false);
+  entry2.AddNumber(":");
+  entry2.AddNumber("#");
+  ASSERT_FALSE(entry2.Matches("AA"));
+  ASSERT_FALSE(entry2.Matches("AA:"));
+  ASSERT_FALSE(entry2.Matches("AA:#"));
+  ASSERT_FALSE(entry2.Matches("AA#:"));
+  ASSERT_FALSE(entry2.Matches("AA:123#"));
+  ASSERT_FALSE(entry2.Matches("AA:123#B"));
+  ASSERT_FALSE(entry2.Matches("AA:B#123"));
+  ASSERT_TRUE(entry2.Matches("AA:1#2"));
+  ASSERT_FALSE(entry2.Matches("AA:123#23:"));
+  ASSERT_FALSE(entry2.Matches("AA::12#234"));
+}
+
+TEST_F(PatternEntryTest, TestPatternAndSuffix) {
+  ObjectLibrary::PatternEntry entry("AA", false);
+  entry.AddSeparator("::");
+  entry.AddSuffix("##");
+  ASSERT_FALSE(entry.Matches("AA"));
+  ASSERT_FALSE(entry.Matches("AA::"));
+  ASSERT_FALSE(entry.Matches("AA::##"));
+  ASSERT_FALSE(entry.Matches("AB::1##"));
+  ASSERT_FALSE(entry.Matches("AB::1##2"));
+  ASSERT_FALSE(entry.Matches("AA##1::"));
+  ASSERT_TRUE(entry.Matches("AA::1##"));
+  ASSERT_FALSE(entry.Matches("AA::1###"));
+
+  ObjectLibrary::PatternEntry entry2("AA", false);
+  entry2.AddSuffix("::");
+  entry2.AddSeparator("##");
+  ASSERT_FALSE(entry2.Matches("AA"));
+  ASSERT_FALSE(entry2.Matches("AA::"));
+  ASSERT_FALSE(entry2.Matches("AA::##"));
+  ASSERT_FALSE(entry2.Matches("AB::1##"));
+  ASSERT_FALSE(entry2.Matches("AB::1##2"));
+  ASSERT_TRUE(entry2.Matches("AA::##12"));
+}
+
+TEST_F(PatternEntryTest, TestTwoNamesAndPattern) {
+  ObjectLibrary::PatternEntry entry("AA", true);
+  entry.AddSeparator("::");
+  entry.AnotherName("BBB");
+  ASSERT_TRUE(entry.Matches("AA"));
+  ASSERT_TRUE(entry.Matches("AA::1"));
+  ASSERT_TRUE(entry.Matches("BBB"));
+  ASSERT_TRUE(entry.Matches("BBB::2"));
+
+  ASSERT_FALSE(entry.Matches("AA::"));
+  ASSERT_FALSE(entry.Matches("AAA::"));
+  ASSERT_FALSE(entry.Matches("BBB::"));
+
+  entry.SetOptional(false);
+  ASSERT_FALSE(entry.Matches("AA"));
+  ASSERT_FALSE(entry.Matches("BBB"));
+
+  ASSERT_FALSE(entry.Matches("AA::"));
+  ASSERT_FALSE(entry.Matches("AAA::"));
+  ASSERT_FALSE(entry.Matches("BBB::"));
+
+  ASSERT_TRUE(entry.Matches("AA::1"));
+  ASSERT_TRUE(entry.Matches("BBB::2"));
+}
+
 }  // namespace ROCKSDB_NAMESPACE
 
 int main(int argc, char** argv) {
@@ -442,7 +648,7 @@ int main(int argc, char** argv) {
 #include <stdio.h>
 
 int main(int /*argc*/, char** /*argv*/) {
-  fprintf(stderr, "SKIPPED as EnvRegistry is not supported in ROCKSDB_LITE\n");
+  fprintf(stderr, "SKIPPED as ObjRegistry is not supported in ROCKSDB_LITE\n");
   return 0;
 }