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diff --git a/Userland/Libraries/LibJS/Runtime/RegExpObject.h b/Userland/Libraries/LibJS/Runtime/RegExpObject.h
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+++ b/Userland/Libraries/LibJS/Runtime/RegExpObject.h
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+/*
+ * Copyright (c) 2020, Matthew Olsson <matthewcolsson@gmail.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <LibJS/AST.h>
+#include <LibJS/Runtime/Object.h>
+#include <LibRegex/Regex.h>
+
+struct Flags {
+    regex::RegexOptions<ECMAScriptFlags> effective_flags;
+    regex::RegexOptions<ECMAScriptFlags> declared_flags;
+};
+
+namespace JS {
+
+class RegExpObject : public Object {
+    JS_OBJECT(RegExpObject, Object);
+
+public:
+    static RegExpObject* create(GlobalObject&, String pattern, String flags);
+
+    RegExpObject(String pattern, String flags, Object& prototype);
+    virtual void initialize(GlobalObject&) override;
+    virtual ~RegExpObject() override;
+
+    const String& pattern() const { return m_pattern; }
+    const String& flags() const { return m_flags; }
+    const regex::RegexOptions<ECMAScriptFlags>& declared_options() { return m_active_flags.declared_flags; }
+    const Regex<ECMA262>& regex() { return m_regex; }
+    const Regex<ECMA262>& regex() const { return m_regex; }
+
+private:
+    JS_DECLARE_NATIVE_GETTER(last_index);
+    JS_DECLARE_NATIVE_SETTER(set_last_index);
+
+    String m_pattern;
+    String m_flags;
+    Flags m_active_flags;
+    Regex<ECMA262> m_regex;
+};
+
+}