Port and integrate the irregexp engine from V8

tests/language/regex/repeat-match-waldemar_test.dart

+// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'util.dart';
+import 'package:expect/expect.dart';
+
+void main() {
+  // "Some test cases identified by Waldemar Horwat in response to this bug:
+  // https:new RegExp(r"/bugs.webkit.org")show_bug.cgi?id=48101"
+
+  shouldBe(new RegExp(r"(?:a*?){2,}").firstMatch("aa"), ["aa"]);
+  shouldBe(new RegExp(r"(?:a*?){2,}").firstMatch("a"), ["a"]);
+  shouldBe(new RegExp(r"(?:a*?){2,}").firstMatch(""), [""]);
+
+  shouldBe(new RegExp(r"(?:a*?)").firstMatch("aa"), [""]);
+  shouldBe(new RegExp(r"(?:a*?)").firstMatch("a"), [""]);
+  shouldBe(new RegExp(r"(?:a*?)").firstMatch(""), [""]);
+
+  shouldBe(new RegExp(r"(?:a*?)(?:a*?)(?:a*?)").firstMatch("aa"), [""]);
+  shouldBe(new RegExp(r"(?:a*?)(?:a*?)(?:a*?)").firstMatch("a"), [""]);
+  shouldBe(new RegExp(r"(?:a*?)(?:a*?)(?:a*?)").firstMatch(""), [""]);
+
+  shouldBe(new RegExp(r"(?:a*?){2}").firstMatch("aa"), [""]);
+  shouldBe(new RegExp(r"(?:a*?){2}").firstMatch("a"), [""]);
+  shouldBe(new RegExp(r"(?:a*?){2}").firstMatch(""), [""]);
+
+  shouldBe(new RegExp(r"(?:a*?){2,3}").firstMatch("aa"), ["a"]);
+  shouldBe(new RegExp(r"(?:a*?){2,3}").firstMatch("a"), ["a"]);
+  shouldBe(new RegExp(r"(?:a*?){2,3}").firstMatch(""), [""]);
+
+  shouldBe(new RegExp(r"(?:a*?)?").firstMatch("aa"), ["a"]);
+  shouldBe(new RegExp(r"(?:a*?)?").firstMatch("a"), ["a"]);
+  shouldBe(new RegExp(r"(?:a*?)?").firstMatch(""), [""]);
+
+  shouldBe(new RegExp(r"(?:a*?)*").firstMatch("aa"), ["aa"]);
+  shouldBe(new RegExp(r"(?:a*?)*").firstMatch("a"), ["a"]);
+  shouldBe(new RegExp(r"(?:a*?)*").firstMatch(""), [""]);
+}