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diff --git a/Source/JavaScriptCore/runtime/RegExp.h b/Source/JavaScriptCore/runtime/RegExp.h
new file mode 100644
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+++ b/Source/JavaScriptCore/runtime/RegExp.h
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+/*
+ *  Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
+ *  Copyright (C) 2007, 2008, 2009 Apple Inc. All rights reserved.
+ *  Copyright (C) 2009 Torch Mobile, Inc.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+#ifndef RegExp_h
+#define RegExp_h
+
+#include "UString.h"
+#include "ExecutableAllocator.h"
+#include <wtf/Forward.h>
+#include <wtf/RefCounted.h>
+
+namespace JSC {
+
+    struct RegExpRepresentation;
+    class JSGlobalData;
+
+    class RegExp : public RefCounted<RegExp> {
+    public:
+        static PassRefPtr<RegExp> create(JSGlobalData* globalData, const UString& pattern, const UString& flags);
+        ~RegExp();
+
+        bool global() const { return m_flagBits & Global; }
+        bool ignoreCase() const { return m_flagBits & IgnoreCase; }
+        bool multiline() const { return m_flagBits & Multiline; }
+
+        const UString& pattern() const { return m_patternString; }
+
+        bool isValid() const { return !m_constructionError; }
+        const char* errorMessage() const { return m_constructionError; }
+
+        int match(const UString&, int startOffset, Vector<int, 32>* ovector = 0);
+        unsigned numSubpatterns() const { return m_numSubpatterns; }
+        
+#if ENABLE(REGEXP_TRACING)
+        void printTraceData();
+#endif
+
+    private:
+        RegExp(JSGlobalData* globalData, const UString& pattern, const UString& flags);
+
+        enum RegExpState {
+            ParseError,
+            JITCode,
+            ByteCode
+        } m_state;
+
+        RegExpState compile(JSGlobalData*);
+
+#if ENABLE(YARR_JIT_DEBUG)
+        void matchCompareWithInterpreter(const UString&, int startOffset, int* offsetVector, int jitResult);
+#endif
+
+        enum FlagBits { Global = 1, IgnoreCase = 2, Multiline = 4 };
+        UString m_patternString;
+        int m_flagBits;
+        const char* m_constructionError;
+        unsigned m_numSubpatterns;
+#if ENABLE(REGEXP_TRACING)
+        unsigned m_rtMatchCallCount;
+        unsigned m_rtMatchFoundCount;
+#endif
+
+        OwnPtr<RegExpRepresentation> m_representation;
+    };
+
+} // namespace JSC
+
+#endif // RegExp_h