@@ -1105,6 +1105,7 @@ set(JavaScriptCore_PRIVATE_FRAMEWORK_HEADERS
     runtime/JSPromise.h
     runtime/JSPromiseConstructor.h
     runtime/JSPropertyNameEnumerator.h
+    runtime/JSRegExpStringIterator.h
     runtime/JSRemoteFunction.h
     runtime/JSRunLoopTimer.h
     runtime/JSScope.h
 
@@ -1421,6 +1421,8 @@
 		8BC064961E1D845C00B2B8CA /* AsyncIteratorPrototype.h in Headers */ = {isa = PBXBuildFile; fileRef = 8BC064941E1D828B00B2B8CA /* AsyncIteratorPrototype.h */; settings = {ATTRIBUTES = (Private, ); }; };
 		8CB955CB2C8AF8E100282DA2 /* JSAsyncFromSyncIterator.h in Headers */ = {isa = PBXBuildFile; fileRef = 8CB955CA2C8AF8E100282DA2 /* JSAsyncFromSyncIterator.h */; };
 		8CB955CD2C8AF8F500282DA2 /* JSAsyncFromSyncIteratorInlines.h in Headers */ = {isa = PBXBuildFile; fileRef = 8CB955CC2C8AF8F500282DA2 /* JSAsyncFromSyncIteratorInlines.h */; };
+		8CB955D12C8E9A0C00282DA2 /* JSRegExpStringIterator.h in Headers */ = {isa = PBXBuildFile; fileRef = 8CB955D02C8E9A0C00282DA2 /* JSRegExpStringIterator.h */; };
+		8CB955D32C8E9A1300282DA2 /* JSRegExpStringIteratorInlines.h in Headers */ = {isa = PBXBuildFile; fileRef = 8CB955D22C8E9A1300282DA2 /* JSRegExpStringIteratorInlines.h */; };
 		8CCBF05D2C804E7E00EEC20B /* WrapForValidIteratorPrototype.h in Headers */ = {isa = PBXBuildFile; fileRef = 8CCBF05C2C804E7E00EEC20B /* WrapForValidIteratorPrototype.h */; };
 		8CCBF05F2C804E8500EEC20B /* WrapForValidIteratorPrototypeInlines.h in Headers */ = {isa = PBXBuildFile; fileRef = 8CCBF05E2C804E8500EEC20B /* WrapForValidIteratorPrototypeInlines.h */; };
 		8CCBF0622C804EAF00EEC20B /* JSWrapForValidIterator.h in Headers */ = {isa = PBXBuildFile; fileRef = 8CCBF0612C804EAF00EEC20B /* JSWrapForValidIterator.h */; };
@@ -4721,6 +4723,9 @@
 		8CB955C92C8AF8D000282DA2 /* JSAsyncFromSyncIterator.cpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.cpp; path = JSAsyncFromSyncIterator.cpp; sourceTree = "<group>"; };
 		8CB955CA2C8AF8E100282DA2 /* JSAsyncFromSyncIterator.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = JSAsyncFromSyncIterator.h; sourceTree = "<group>"; };
 		8CB955CC2C8AF8F500282DA2 /* JSAsyncFromSyncIteratorInlines.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = JSAsyncFromSyncIteratorInlines.h; sourceTree = "<group>"; };
+		8CB955D02C8E9A0C00282DA2 /* JSRegExpStringIterator.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = JSRegExpStringIterator.h; sourceTree = "<group>"; };
+		8CB955D22C8E9A1300282DA2 /* JSRegExpStringIteratorInlines.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = JSRegExpStringIteratorInlines.h; sourceTree = "<group>"; };
+		8CB955D42C8E9A1900282DA2 /* JSRegExpStringIterator.cpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.cpp; path = JSRegExpStringIterator.cpp; sourceTree = "<group>"; };
 		8CCBF05B2C804E7800EEC20B /* WrapForValidIteratorPrototype.cpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.cpp; path = WrapForValidIteratorPrototype.cpp; sourceTree = "<group>"; };
 		8CCBF05C2C804E7E00EEC20B /* WrapForValidIteratorPrototype.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = WrapForValidIteratorPrototype.h; sourceTree = "<group>"; };
 		8CCBF05E2C804E8500EEC20B /* WrapForValidIteratorPrototypeInlines.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = WrapForValidIteratorPrototypeInlines.h; sourceTree = "<group>"; };
@@ -8455,6 +8460,9 @@
 				2A05ABD31961DF2400341750 /* JSPropertyNameEnumerator.cpp */,
 				2A05ABD41961DF2400341750 /* JSPropertyNameEnumerator.h */,
 				276B387A2A71D11700252F4E /* JSPropertyNameEnumeratorInlines.h */,
+				8CB955D42C8E9A1900282DA2 /* JSRegExpStringIterator.cpp */,
+				8CB955D02C8E9A0C00282DA2 /* JSRegExpStringIterator.h */,
+				8CB955D22C8E9A1300282DA2 /* JSRegExpStringIteratorInlines.h */,
 				5B40327F2798D1FD00F37939 /* JSRemoteFunction.cpp */,
 				5B40327E2798D1FD00F37939 /* JSRemoteFunction.h */,
 				276B38792A71D11700252F4E /* JSRemoteFunctionInlines.h */,
@@ -11332,6 +11340,8 @@
 				7C184E1F17BEE22E007CB63A /* JSPromisePrototype.h in Headers */,
 				2A05ABD61961DF2400341750 /* JSPropertyNameEnumerator.h in Headers */,
 				276B387D2A71D11800252F4E /* JSPropertyNameEnumeratorInlines.h in Headers */,
+				8CB955D12C8E9A0C00282DA2 /* JSRegExpStringIterator.h in Headers */,
+				8CB955D32C8E9A1300282DA2 /* JSRegExpStringIteratorInlines.h in Headers */,
 				5B4032802798D20600F37939 /* JSRemoteFunction.h in Headers */,
 				276B387C2A71D11800252F4E /* JSRemoteFunctionInlines.h in Headers */,
 				A552C3801ADDB8FE00139726 /* JSRemoteInspector.h in Headers */,
 
@@ -947,6 +947,7 @@ runtime/JSPromise.cpp
 runtime/JSPromiseConstructor.cpp
 runtime/JSPromisePrototype.cpp
 runtime/JSPropertyNameEnumerator.cpp
+runtime/JSRegExpStringIterator.cpp
 runtime/JSRemoteFunction.cpp
 runtime/JSRunLoopTimer.cpp
 runtime/JSScope.cpp
 
@@ -178,11 +178,6 @@ namespace JSC {
     macro(regExpSearchFast) \
     macro(regExpSplitFast) \
     macro(regExpTestFast) \
-    macro(regExpStringIteratorRegExp) \
-    macro(regExpStringIteratorString) \
-    macro(regExpStringIteratorGlobal) \
-    macro(regExpStringIteratorUnicode) \
-    macro(regExpStringIteratorDone) \
     macro(stringIncludesInternal) \
     macro(stringIndexOfInternal) \
     macro(stringSplitFast) \
@@ -222,6 +217,7 @@ namespace JSC {
     macro(pop) \
     macro(wrapForValidIteratorCreate) \
     macro(asyncFromSyncIteratorCreate) \
+    macro(regExpStringIteratorCreate) \
 
 
 namespace Symbols {
 
@@ -23,19 +23,6 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
  */
 
-@linkTimeConstant
-@constructor
-function RegExpStringIterator(regExp, string, global, fullUnicode)
-{
-    "use strict";
-
-    @putByIdDirectPrivate(this, "regExpStringIteratorRegExp", regExp);
-    @putByIdDirectPrivate(this, "regExpStringIteratorString", string);
-    @putByIdDirectPrivate(this, "regExpStringIteratorGlobal", global);
-    @putByIdDirectPrivate(this, "regExpStringIteratorUnicode", fullUnicode);
-    @putByIdDirectPrivate(this, "regExpStringIteratorDone", false);
-}
-
 @linkTimeConstant
 function advanceStringIndex(string, index, unicode)
 {
@@ -175,7 +162,7 @@ function matchAll(strArg)
     var global = @stringIncludesInternal.@call(flags, "g");
     var fullUnicode = @stringIncludesInternal.@call(flags, "u") || @stringIncludesInternal.@call(flags, "v");
 
-    return new @RegExpStringIterator(matcher, string, global, fullUnicode);
+    return @regExpStringIteratorCreate(matcher, string, global, fullUnicode);
 }
 
 @linkTimeConstant
 
@@ -30,20 +30,20 @@ function next()
     if (!@isObject(this))
         @throwTypeError("%RegExpStringIteratorPrototype%.next requires |this| to be an Object");
 
-    var done = @getByIdDirectPrivate(this, "regExpStringIteratorDone");
-    if (done === @undefined)
+    if (!@isRegExpStringIterator(this))
         @throwTypeError("%RegExpStringIteratorPrototype%.next requires |this| to be an RegExp String Iterator instance");
 
+    var done = @getRegExpStringIteratorInternalField(this, @regExpStringIteratorFieldDone);
     if (done)
         return { value: @undefined, done: true };
 
-    var regExp = @getByIdDirectPrivate(this, "regExpStringIteratorRegExp");
-    var string = @getByIdDirectPrivate(this, "regExpStringIteratorString");
-    var global = @getByIdDirectPrivate(this, "regExpStringIteratorGlobal");
-    var fullUnicode = @getByIdDirectPrivate(this, "regExpStringIteratorUnicode");
+    var regExp = @getRegExpStringIteratorInternalField(this, @regExpStringIteratorFieldRegExp);
+    var string = @getRegExpStringIteratorInternalField(this, @regExpStringIteratorFieldString);
+    var global = @getRegExpStringIteratorInternalField(this, @regExpStringIteratorFieldGlobal);
+    var fullUnicode = @getRegExpStringIteratorInternalField(this, @regExpStringIteratorFieldFullUnicode);
     var match = @regExpExec(regExp, string);
     if (match === null) {
-        @putByIdDirectPrivate(this, "regExpStringIteratorDone", true);
+        @putRegExpStringIteratorInternalField(this, @regExpStringIteratorFieldDone, true);
         return { value: @undefined, done: true };
     }
 
@@ -54,7 +54,7 @@ function next()
             regExp.lastIndex = @advanceStringIndex(string, thisIndex, fullUnicode);
         }
     } else
-        @putByIdDirectPrivate(this, "regExpStringIteratorDone", true);
+        @putRegExpStringIteratorInternalField(this, @regExpStringIteratorFieldDone, true);
 
     return { value: match, done: false };
 }
@@ -41,6 +41,7 @@
 #include "JSMapIterator.h"
 #include "JSModuleLoader.h"
 #include "JSPromise.h"
+#include "JSRegExpStringIterator.h"
 #include "JSSetIterator.h"
 #include "JSStringIterator.h"
 #include "JSWrapForValidIterator.h"
@@ -129,6 +130,11 @@ BytecodeIntrinsicRegistry::BytecodeIntrinsicRegistry(VM& vm)
     m_abstractModuleRecordFieldState.set(m_vm, jsNumber(static_cast<int32_t>(AbstractModuleRecord::Field::State)));
     m_wrapForValidIteratorFieldIteratedIterator.set(m_vm, jsNumber(static_cast<int32_t>(JSWrapForValidIterator::Field::IteratedIterator)));
     m_wrapForValidIteratorFieldIteratedNextMethod.set(m_vm, jsNumber(static_cast<int32_t>(JSWrapForValidIterator::Field::IteratedNextMethod)));
+    m_regExpStringIteratorFieldRegExp.set(m_vm, jsNumber(static_cast<int32_t>(JSRegExpStringIterator::Field::RegExp)));
+    m_regExpStringIteratorFieldString.set(m_vm, jsNumber(static_cast<int32_t>(JSRegExpStringIterator::Field::String)));
+    m_regExpStringIteratorFieldGlobal.set(m_vm, jsNumber(static_cast<int32_t>(JSRegExpStringIterator::Field::Global)));
+    m_regExpStringIteratorFieldFullUnicode.set(m_vm, jsNumber(static_cast<int32_t>(JSRegExpStringIterator::Field::FullUnicode)));
+    m_regExpStringIteratorFieldDone.set(m_vm, jsNumber(static_cast<int32_t>(JSRegExpStringIterator::Field::Done)));
 }
 
 std::optional<BytecodeIntrinsicRegistry::Entry> BytecodeIntrinsicRegistry::lookup(const Identifier& ident) const
 
@@ -56,6 +56,7 @@ enum class LinkTimeConstant : int32_t;
     macro(getStringIteratorInternalField) \
     macro(getMapIteratorInternalField) \
     macro(getSetIteratorInternalField) \
+    macro(getRegExpStringIteratorInternalField) \
     macro(getProxyInternalField) \
     macro(getWrapForValidIteratorInternalField) \
     macro(idWithProfile) \
@@ -78,6 +79,7 @@ enum class LinkTimeConstant : int32_t;
     macro(isSetIterator) \
     macro(isUndefinedOrNull) \
     macro(isWrapForValidIterator) \
+    macro(isRegExpStringIterator) \
     macro(tailCallForwardArguments) \
     macro(throwTypeError) \
     macro(throwRangeError) \
@@ -96,6 +98,7 @@ enum class LinkTimeConstant : int32_t;
     macro(putStringIteratorInternalField) \
     macro(putMapIteratorInternalField) \
     macro(putSetIteratorInternalField) \
+    macro(putRegExpStringIteratorInternalField) \
     macro(superSamplerBegin) \
     macro(superSamplerEnd) \
     macro(toNumber) \
@@ -180,6 +183,11 @@ enum class LinkTimeConstant : int32_t;
     macro(abstractModuleRecordFieldState) \
     macro(wrapForValidIteratorFieldIteratedIterator) \
     macro(wrapForValidIteratorFieldIteratedNextMethod) \
+    macro(regExpStringIteratorFieldRegExp) \
+    macro(regExpStringIteratorFieldString) \
+    macro(regExpStringIteratorFieldGlobal) \
+    macro(regExpStringIteratorFieldFullUnicode) \
+    macro(regExpStringIteratorFieldDone) \
 
 
 #define JSC_COMMON_BYTECODE_INTRINSIC_CONSTANTS_CUSTOM_EACH_NAME(macro) \
 
@@ -151,6 +151,7 @@ class JSGlobalObject;
     v(BigUint64Array, nullptr) \
     v(wrapForValidIteratorCreate, nullptr) \
     v(asyncFromSyncIteratorCreate, nullptr) \
+    v(regExpStringIteratorCreate, nullptr) \
 
 
 #define DECLARE_LINK_TIME_CONSTANT(name, code) name,
 
@@ -933,6 +933,7 @@ namespace JSC {
         RegisterID* emitIsMapIterator(RegisterID* dst, RegisterID* src) { return emitIsCellWithType(dst, src, JSMapIteratorType); }
         RegisterID* emitIsSetIterator(RegisterID* dst, RegisterID* src) { return emitIsCellWithType(dst, src, JSSetIteratorType); }
         RegisterID* emitIsWrapForValidIterator(RegisterID* dst, RegisterID* src) { return emitIsCellWithType(dst, src, JSWrapForValidIteratorType); }
+        RegisterID* emitIsRegExpStringIterator(RegisterID* dst, RegisterID* src) { return emitIsCellWithType(dst, src, JSRegExpStringIteratorType); }
         RegisterID* emitIsObject(RegisterID* dst, RegisterID* src);
         RegisterID* emitIsCallable(RegisterID* dst, RegisterID* src);
         RegisterID* emitIsConstructor(RegisterID* dst, RegisterID* src);