Port and integrate the irregexp engine from V8

tests/language/regex/indexof_test.dart

Index: tests/language/regex/indexof_test.dart
diff --git a/tests/language/regex/indexof_test.dart b/tests/language/regex/indexof_test.dart
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+++ b/tests/language/regex/indexof_test.dart
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+// 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() {
+  dynamic CheckMatch(re, str, matches) {
+    assertEquals(matches.length > 0, re.hasMatch(str));
+    var result = re.allMatches(str).toList();
+    if (matches.length > 0) {
+      assertEquals(matches.length, result.length);
+      var lastExpected;
+      var lastFrom;
+      var lastLength;
+      for (var idx = 0; idx < matches.length; idx++) {
+        var from = matches[idx][0];
+        var length = matches[idx][1];
+        var expected = str.substring(from, from + length);
+        var name = "$str[$from..${from+length}]";
+        assertEquals(expected, result[idx].group(0), name);
+      }
+    } else {
+      assertTrue(result.isEmpty);
+    }
+  }
+
+  CheckMatch(new RegExp(r"abc"), "xxxabcxxxabcxxx", [[3, 3], [9, 3]]);
+  CheckMatch(new RegExp(r"abc"), "abcabcabc", [[0, 3], [3, 3], [6, 3]]);
+  CheckMatch(new RegExp(r"aba"), "ababababa", [[0, 3], [4, 3]]);
+  CheckMatch(new RegExp(r"foo"), "ofooofoooofofooofo", [[1, 3], [5, 3], [12, 3]]);
+  CheckMatch(new RegExp(r"foobarbaz"), "xx", []);
+  CheckMatch(new RegExp(r"abc"), "abababa", []);
+
+  assertEquals("xxxdefxxxdefxxx", "xxxabcxxxabcxxx".replaceAll(new RegExp(r"abc"), "def"));
+  assertEquals("o-o-oofo-ofo", "ofooofoooofofooofo".replaceAll(new RegExp(r"foo"), "-"));
+  assertEquals("deded", "deded".replaceAll(new RegExp(r"x"), "-"));
+  assertEquals("-a-b-c-d-e-f-", "abcdef".replaceAll(new RegExp(""), "-"));
+
+  CheckMatch(new RegExp(r"a(.)"), "xyzzyabxyzzyacxyzzy", [[5, 2], [12, 2]]);
+
+  CheckMatch(new RegExp(r"a|(?:)"), "aba", [[0, 1], [1, 0], [2, 1], [3, 0]]);
+  CheckMatch(new RegExp(r"a|(?:)"), "baba", [[0, 0], [1, 1], [2, 0], [3, 1], [4, 0]]);
+  CheckMatch(new RegExp(r"a|(?:)"), "bab", [[0, 0], [1, 1], [2, 0], [3, 0]]);
+}