Port and integrate the irregexp engine from V8

tests/language/regex/regexp_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 "package:expect/expect.dart";
+
+void testEscape(str, regex) {
+  assertEquals("foo:bar:baz", str.split(regex).join(":"));
+}
+
+void assertEquals(actual, expected, [message]) => Expect.equals(actual, expected, message);

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long line

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Done.

+void assertTrue(actual, [message]) => Expect.isTrue(actual, message);
+void assertFalse(actual, [message]) => Expect.isFalse(actual, message);
+void assertThrows(fn) => Expect.throws(fn);
+
+void main() {
+  testEscape("foo\nbar\nbaz", new RegExp(r"\n"));
+  testEscape("foo bar baz", new RegExp(r"\s"));
+  testEscape("foo\tbar\tbaz", new RegExp(r"\s"));
+  testEscape("foo-bar-baz", new RegExp(r"\u002D"));
+
+  // Test containing null char in regexp.
+  var s = '[' + new String.fromCharCode(0) + ']';
+  var re = new RegExp(s);
+  assertEquals(re.allMatches(s).length, 1);
+  assertEquals(re.stringMatch(s), new String.fromCharCode(0));
+
+  // Test strings containing all line separators
+  s = 'aA\nbB\rcC\r\ndD\u2028eE\u2029fF';
+  re = new RegExp(r"^.", multiLine: true); // any non-newline character at the beginning of a line

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long line

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Done.

+  var result = re.allMatches(s).toList();
+  assertEquals(result.length, 6);
+  assertEquals(result[0][0], 'a');
+  assertEquals(result[1][0], 'b');
+  assertEquals(result[2][0], 'c');
+  assertEquals(result[3][0], 'd');
+  assertEquals(result[4][0], 'e');
+  assertEquals(result[5][0], 'f');
+
+  re = new RegExp(r".$", multiLine: true); // any non-newline character at the end of a line

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long line

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Done.

+  result = re.allMatches(s).toList();
+  assertEquals(result.length, 6);
+  assertEquals(result[0][0], 'A');
+  assertEquals(result[1][0], 'B');
+  assertEquals(result[2][0], 'C');
+  assertEquals(result[3][0], 'D');
+  assertEquals(result[4][0], 'E');
+  assertEquals(result[5][0], 'F');
+
+  re = new RegExp(r"^[^]", multiLine: true); // *any* character at the beginning of a line

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long line

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Done.

+  result = re.allMatches(s).toList();
+  assertEquals(result.length, 7);
+  assertEquals(result[0][0], 'a');
+  assertEquals(result[1][0], 'b');
+  assertEquals(result[2][0], 'c');
+  assertEquals(result[3][0], '\n');
+  assertEquals(result[4][0], 'd');
+  assertEquals(result[5][0], 'e');
+  assertEquals(result[6][0], 'f');
+
+  re = new RegExp(r"[^]$", multiLine: true); // *any* character at the end of a line

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long line

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Done.

+  result = re.allMatches(s).toList();
+  assertEquals(result.length, 7);
+  assertEquals(result[0][0], 'A');
+  assertEquals(result[1][0], 'B');
+  assertEquals(result[2][0], 'C');
+  assertEquals(result[3][0], '\r');
+  assertEquals(result[4][0], 'D');
+  assertEquals(result[5][0], 'E');
+  assertEquals(result[6][0], 'F');
+
+  // Some tests from the Mozilla tests, where our behavior used to differ from
+  // SpiderMonkey.
+  // From ecma_3/RegExp/regress-334158.js
+  assertTrue( "\x01" .contains(new RegExp(r"\ca")));
+  assertFalse( "\\ca" .contains(new RegExp(r"\ca")));
+  assertFalse( "ca" .contains(new RegExp(r"\ca")));
+  assertTrue( "\\ca" .contains(new RegExp(r"\c[a/]")));
+  assertTrue( "\\c/" .contains(new RegExp(r"\c[a/]")));
+
+  // Test \c in character class
+  re = r"^[\cM]$";
+  assertTrue("\r".contains(new RegExp(re)));
+  assertFalse("M".contains(new RegExp(re)));
+  assertFalse("c".contains(new RegExp(re)));
+  assertFalse("\\".contains(new RegExp(re)));
+  assertFalse("\x03".contains(new RegExp(re)));  // I.e., read as \cc
+
+  re = r"^[\c]]$";
+  assertTrue("c]".contains(new RegExp(re)));
+  assertTrue("\\]".contains(new RegExp(re)));
+  assertFalse("\x1d".contains(new RegExp(re)));  // ']' & 0x1f
+  assertFalse("\x03]".contains(new RegExp(re)));  // I.e., read as \cc
+
+  re = r"^[\c1]$";  // Digit control characters are masked in character classes.
+  assertTrue("\x11".contains(new RegExp(re)));
+  assertFalse("\\".contains(new RegExp(re)));
+  assertFalse("c".contains(new RegExp(re)));
+  assertFalse("1".contains(new RegExp(re)));
+
+  re = r"^[\c_]$";  // Underscore control character is masked in character classes.

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long line

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Done.

+  assertTrue("\x1f".contains(new RegExp(re)));
+  assertFalse("\\".contains(new RegExp(re)));
+  assertFalse("c".contains(new RegExp(re)));
+  assertFalse("_".contains(new RegExp(re)));
+
+  re = r"^[\c$]$";  // Other characters are interpreted literally.
+  assertFalse("\x04".contains(new RegExp(re)));
+  assertTrue("\\".contains(new RegExp(re)));
+  assertTrue("c".contains(new RegExp(re)));
+  assertTrue(r"$".contains(new RegExp(re)));
+
+  assertTrue("Z[\\cde".contains(new RegExp(r"^[Z-\c-e]*$")));
+
+  // Test that we handle \s and \S correctly on special Unicode characters.
+  re = r"\s";
+  assertTrue("\u2028".contains(new RegExp(re)));
+  assertTrue("\u2029".contains(new RegExp(re)));
+  assertTrue("\uFEFF".contains(new RegExp(re)));
+
+  re = r"\S";
+  assertFalse("\u2028".contains(new RegExp(re)));
+  assertFalse("\u2029".contains(new RegExp(re)));
+  assertFalse("\uFEFF".contains(new RegExp(re)));
+
+  // Test that we handle \s and \S correctly inside some bizarre
+  // character classes.
+  re = r"[\s-:]";
+  assertTrue('-'.contains(new RegExp(re)));
+  assertTrue(':'.contains(new RegExp(re)));
+  assertTrue(' '.contains(new RegExp(re)));
+  assertTrue('\t'.contains(new RegExp(re)));
+  assertTrue('\n'.contains(new RegExp(re)));
+  assertFalse('a'.contains(new RegExp(re)));
+  assertFalse('Z'.contains(new RegExp(re)));
+
+  re = r"[\S-:]";
+  assertTrue('-'.contains(new RegExp(re)));
+  assertTrue(':'.contains(new RegExp(re)));
+  assertFalse(' '.contains(new RegExp(re)));
+  assertFalse('\t'.contains(new RegExp(re)));
+  assertFalse('\n'.contains(new RegExp(re)));
+  assertTrue('a'.contains(new RegExp(re)));
+  assertTrue('Z'.contains(new RegExp(re)));
+
+  re = r"[^\s-:]";
+  assertFalse('-'.contains(new RegExp(re)));
+  assertFalse(':'.contains(new RegExp(re)));
+  assertFalse(' '.contains(new RegExp(re)));
+  assertFalse('\t'.contains(new RegExp(re)));
+  assertFalse('\n'.contains(new RegExp(re)));
+  assertTrue('a'.contains(new RegExp(re)));
+  assertTrue('Z'.contains(new RegExp(re)));
+
+  re = r"[^\S-:]";
+  assertFalse('-'.contains(new RegExp(re)));
+  assertFalse(':'.contains(new RegExp(re)));
+  assertTrue(' '.contains(new RegExp(re)));
+  assertTrue('\t'.contains(new RegExp(re)));
+  assertTrue('\n'.contains(new RegExp(re)));
+  assertFalse('a'.contains(new RegExp(re)));
+  assertFalse('Z'.contains(new RegExp(re)));
+
+  re = r"[\s]";
+  assertFalse('-'.contains(new RegExp(re)));
+  assertFalse(':'.contains(new RegExp(re)));
+  assertTrue(' '.contains(new RegExp(re)));
+  assertTrue('\t'.contains(new RegExp(re)));
+  assertTrue('\n'.contains(new RegExp(re)));
+  assertFalse('a'.contains(new RegExp(re)));
+  assertFalse('Z'.contains(new RegExp(re)));
+
+  re = r"[^\s]";
+  assertTrue('-'.contains(new RegExp(re)));
+  assertTrue(':'.contains(new RegExp(re)));
+  assertFalse(' '.contains(new RegExp(re)));
+  assertFalse('\t'.contains(new RegExp(re)));
+  assertFalse('\n'.contains(new RegExp(re)));
+  assertTrue('a'.contains(new RegExp(re)));
+  assertTrue('Z'.contains(new RegExp(re)));
+
+  re = r"[\S]";
+  assertTrue('-'.contains(new RegExp(re)));
+  assertTrue(':'.contains(new RegExp(re)));
+  assertFalse(' '.contains(new RegExp(re)));
+  assertFalse('\t'.contains(new RegExp(re)));
+  assertFalse('\n'.contains(new RegExp(re)));
+  assertTrue('a'.contains(new RegExp(re)));
+  assertTrue('Z'.contains(new RegExp(re)));
+
+  re = r"[^\S]";
+  assertFalse('-'.contains(new RegExp(re)));
+  assertFalse(':'.contains(new RegExp(re)));
+  assertTrue(' '.contains(new RegExp(re)));
+  assertTrue('\t'.contains(new RegExp(re)));
+  assertTrue('\n'.contains(new RegExp(re)));
+  assertFalse('a'.contains(new RegExp(re)));
+  assertFalse('Z'.contains(new RegExp(re)));
+
+  re = r"[\s\S]";
+  assertTrue('-'.contains(new RegExp(re)));
+  assertTrue(':'.contains(new RegExp(re)));
+  assertTrue(' '.contains(new RegExp(re)));
+  assertTrue('\t'.contains(new RegExp(re)));
+  assertTrue('\n'.contains(new RegExp(re)));
+  assertTrue('a'.contains(new RegExp(re)));
+  assertTrue('Z'.contains(new RegExp(re)));
+
+  re = r"[^\s\S]";
+  assertFalse('-'.contains(new RegExp(re)));
+  assertFalse(':'.contains(new RegExp(re)));
+  assertFalse(' '.contains(new RegExp(re)));
+  assertFalse('\t'.contains(new RegExp(re)));
+  assertFalse('\n'.contains(new RegExp(re)));
+  assertFalse('a'.contains(new RegExp(re)));
+  assertFalse('Z'.contains(new RegExp(re)));
+
+  // First - is treated as range operator, second as literal minus.
+  // This follows the specification in parsing, but doesn't throw on
+  // the \s at the beginning of the range.
+  re = r"[\s-0-9]";
+  assertTrue(' '.contains(new RegExp(re)));
+  assertTrue('\xA0'.contains(new RegExp(re)));
+  assertTrue('-'.contains(new RegExp(re)));
+  assertTrue('0'.contains(new RegExp(re)));
+  assertTrue('9'.contains(new RegExp(re)));
+  assertFalse('1'.contains(new RegExp(re)));
+
+  // Test beginning and end of line assertions with or without the
+  // multiline flag.
+  re = r"^\d+";
+  assertFalse("asdf\n123".contains(new RegExp(re)));
+  re = new RegExp(r"^\d+", multiLine: true);
+  assertTrue("asdf\n123".contains(re));
+
+  re = r"\d+$";
+  assertFalse("123\nasdf".contains(new RegExp(re)));
+  re = new RegExp(r"\d+$", multiLine: true);
+  assertTrue("123\nasdf".contains(re));
+
+  // Test that empty matches are handled correctly for multiline global
+  // regexps.
+  re = new RegExp(r"^(.*)", multiLine: true);
+  assertEquals(3, re.allMatches("a\n\rb").length);
+  assertEquals("*a\n*b\r*c\n*\r*d\r*\n*e",
+      "a\nb\rc\n\rd\r\ne".replaceAllMapped(re, (Match m) => "*${m.group(1)}"));
+
+  // Test that empty matches advance one character
+  re = new RegExp("");
+  assertEquals("xAx", "A".replaceAll(re, "x"));
+  assertEquals(3, new String.fromCharCode(161).replaceAll(re, "x").length);
+
+  // Check for lazy RegExp literal creation
+  void lazyLiteral(doit) {
+    if (doit) return "".replaceAll(new RegExp(r"foo(", caseSensitive: false), "");

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long line

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Done.

+    return true;
+  }
+
+  assertTrue(lazyLiteral(false));
+  assertThrows(() => lazyLiteral(true));
+
+  // Check $01 and $10
+  re = new RegExp("(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)");
+  assertEquals("t", "123456789t".replaceAllMapped(re, (Match m) => m.group(10)));

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long line

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long line

[jgruber1, 2014/09/05 06:17:26]

Done.

[jgruber1, 2014/09/05 06:17:26]

Done.

+  assertEquals("15", "123456789t".replaceAllMapped(re, (Match m) => "${m.group(1)}5"));

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long line

[jgruber1, 2014/09/05 06:17:26]

Done.

+  assertEquals("1", "123456789t".replaceAllMapped(re, (Match m) => m.group(1)));
+
+  assertFalse("football".contains(new RegExp(r"()foo$\1")), "football1");
+  assertFalse("football".contains(new RegExp(r"foo$(?=ball)")), "football2");
+  assertFalse("football".contains(new RegExp(r"foo$(?!bar)")), "football3");
+  assertTrue("foo".contains(new RegExp(r"()foo$\1")), "football4");
+  assertTrue("foo".contains(new RegExp(r"foo$(?=(ball)?)")), "football5");
+  assertTrue("foo".contains(new RegExp(r"()foo$(?!bar)")), "football6");
+  assertFalse("football".contains(new RegExp(r"(x?)foo$\1")), "football7");
+  assertFalse("football".contains(new RegExp(r"foo$(?=ball)")), "football8");
+  assertFalse("football".contains(new RegExp(r"foo$(?!bar)")), "football9");
+  assertTrue("foo".contains(new RegExp(r"(x?)foo$\1")), "football10");
+  assertTrue("foo".contains(new RegExp(r"foo$(?=(ball)?)")), "football11");
+  assertTrue("foo".contains(new RegExp(r"foo$(?!bar)")), "football12");
+
+  // Check that the back reference has two successors.  See
+  // BackReferenceNode::PropagateForward.
+  assertFalse('foo'.contains(new RegExp(r"f(o)\b\1")));
+  assertTrue('foo'.contains(new RegExp(r"f(o)\B\1")));
+
+  // Back-reference, ignore case:
+  // ASCII
+  assertEquals("a", new RegExp(r"x(a)\1x", caseSensitive: false).firstMatch("xaAx").group(1), "backref-ASCII");

[ricow1, 2014/09/05 05:47:41]

long line + a lot below

[jgruber1, 2014/09/05 06:17:25]

Done.

+  assertFalse("xaaaaa".contains(new RegExp(r"x(...)\1", caseSensitive: false)), "backref-ASCII-short");
+  assertTrue("xx".contains(new RegExp(r"x((?:))\1\1x", caseSensitive: false)), "backref-ASCII-empty");
+  assertTrue("xabcx".contains(new RegExp(r"x(?:...|(...))\1x", caseSensitive: false)), "backref-ASCII-uncaptured");
+  assertTrue("xabcABCx".contains(new RegExp(r"x(?:...|(...))\1x", caseSensitive: false)), "backref-ASCII-backtrack");
+  assertEquals("aBc",
+               new RegExp(r"x(...)\1\1x", caseSensitive: false).firstMatch("xaBcAbCABCx").group(1),
+               "backref-ASCII-twice");
+
+  for (var i = 0; i < 128; i++) {
+    var testName = "backref-ASCII-char-$i,,${i^0x20}";
+    var test = new String.fromCharCodes([i, i ^ 0x20]).contains(new RegExp(r"^(.)\1$", caseSensitive: false));
+    if (('A'.codeUnitAt(0) <= i && i <= 'Z'.codeUnitAt(0)) ||
+        ('a'.codeUnitAt(0) <= i && i <= 'z'.codeUnitAt(0))) {
+      assertTrue(test, testName);
+    } else {
+      assertFalse(test, testName);
+    }
+  }
+
+  assertFalse('foo'.contains(new RegExp(r"f(o)$\1")), "backref detects at_end");
+
+  // Check decimal escapes doesn't overflow.
+  // (Note: \214 is interpreted as octal).
+  assertEquals("\x8c7483648",
+                    new RegExp(r"\2147483648").firstMatch("\x8c7483648").group(0),
+                    "Overflow decimal escape");
+
+  // Check numbers in quantifiers doesn't overflow and doesn't throw on
+  // too large numbers.
+  assertFalse('b'.contains(new RegExp(r"a{111111111111111111111111111111111111111111111}")),
+              "overlarge1");
+  assertFalse('b'.contains(new RegExp(r"a{999999999999999999999999999999999999999999999}")),
+              "overlarge2");
+  assertFalse('b'.contains(new RegExp(r"a{1,111111111111111111111111111111111111111111111}")),
+              "overlarge3");
+  assertFalse('b'.contains(new RegExp(r"a{1,999999999999999999999999999999999999999999999}")),
+              "overlarge4");
+  assertFalse('b'.contains(new RegExp(r"a{2147483648}")),
+              "overlarge5");
+  assertFalse('b'.contains(new RegExp(r"a{21474836471}")),
+              "overlarge6");
+  assertFalse('b'.contains(new RegExp(r"a{1,2147483648}")),
+              "overlarge7");
+  assertFalse('b'.contains(new RegExp(r"a{1,21474836471}")),
+              "overlarge8");
+  assertFalse('b'.contains(new RegExp(r"a{2147483648,2147483648}")),
+              "overlarge9");
+  assertFalse('b'.contains(new RegExp(r"a{21474836471,21474836471}")),
+              "overlarge10");
+  assertFalse('b'.contains(new RegExp(r"a{2147483647}")),
+              "overlarge11");
+  assertFalse('b'.contains(new RegExp(r"a{1,2147483647}")),
+              "overlarge12");
+  assertTrue('a'.contains(new RegExp(r"a{1,2147483647}")),
+              "overlarge13");
+  assertFalse('a'.contains(new RegExp(r"a{2147483647,2147483647}")),
+              "overlarge14");
+
+  // Check that we don't read past the end of the string.
+  assertFalse('b'.contains(new RegExp(r"f")));
+  assertFalse('x'.contains(new RegExp(r"[abc]f")));
+  assertFalse('xa'.contains(new RegExp(r"[abc]f")));
+  assertFalse('x'.contains(new RegExp(r"[abc]<")));
+  assertFalse('xa'.contains(new RegExp(r"[abc]<")));
+  assertFalse('b'.contains(new RegExp(r"f", caseSensitive: false)));
+  assertFalse('x'.contains(new RegExp(r"[abc]f", caseSensitive: false)));
+  assertFalse('xa'.contains(new RegExp(r"[abc]f", caseSensitive: false)));
+  assertFalse('x'.contains(new RegExp(r"[abc]<", caseSensitive: false)));
+  assertFalse('xa'.contains(new RegExp(r"[abc]<", caseSensitive: false)));
+  assertFalse('x'.contains(new RegExp(r"f[abc]")));
+  assertFalse('xa'.contains(new RegExp(r"f[abc]")));
+  assertFalse('x'.contains(new RegExp(r"<[abc]")));
+  assertFalse('xa'.contains(new RegExp(r"<[abc]")));
+  assertFalse('x'.contains(new RegExp(r"f[abc]", caseSensitive: false)));
+  assertFalse('xa'.contains(new RegExp(r"f[abc]", caseSensitive: false)));
+  assertFalse('x'.contains(new RegExp(r"<[abc]", caseSensitive: false)));
+  assertFalse('xa'.contains(new RegExp(r"<[abc]", caseSensitive: false)));
+
+  // Test that merging of quick test masks gets it right.
+  assertFalse('x7%%y'.contains(new RegExp(r"x([0-7]%%x|[0-6]%%y)")), 'qt');
+  assertFalse('xy7%%%y'.contains(new RegExp(r"()x\1(y([0-7]%%%x|[0-6]%%%y)|dkjasldkas)")), 'qt2');
+  assertFalse('xy%%%y'.contains(new RegExp(r"()x\1(y([0-7]%%%x|[0-6]%%%y)|dkjasldkas)")), 'qt3');
+  assertFalse('xy7%%%y'.contains(new RegExp(r"()x\1y([0-7]%%%x|[0-6]%%%y)")), 'qt4');
+  assertFalse('xy%%%y'.contains(new RegExp(r"()x\1(y([0-7]%%%x|[0-6]%%%y)|dkjasldkas)")), 'qt5');
+  assertFalse('xy7%%%y'.contains(new RegExp(r"()x\1y([0-7]%%%x|[0-6]%%%y)")), 'qt6');
+  assertFalse('xy7%%%y'.contains(new RegExp(r"xy([0-7]%%%x|[0-6]%%%y)")), 'qt7');
+  assertFalse('x7%%%y'.contains(new RegExp(r"x([0-7]%%%x|[0-6]%%%y)")), 'qt8');
+
+
+  // Don't hang on this one.
+  "".contains(new RegExp(r"[^\xfe-\xff]*"));
+
+  var longbuffer = new StringBuffer("a");
+  for (var i = 0; i < 100000; i++) {
+    longbuffer.write("a?");
+  }
+  var long = longbuffer.toString();
+
+  // Don't crash on this one, but maybe throw an exception.
+  try {
+    new RegExp(long).allMatches("a");
+  } catch (e) {
+    assertTrue(String(e).indexOf("Stack overflow") >= 0, "overflow");
+  }
+
+
+  // Test boundary-checks.
+  void assertRegExpTest(re, input, test) {
+    assertEquals(test, input.contains(new RegExp(re)), "test:" + re + ":" + input);
+  }
+
+  assertRegExpTest(r"b\b", "b", true);
+  assertRegExpTest(r"b\b$", "b", true);
+  assertRegExpTest(r"\bb", "b", true);
+  assertRegExpTest(r"^\bb", "b", true);
+  assertRegExpTest(r",\b", ",", false);
+  assertRegExpTest(r",\b$", ",", false);
+  assertRegExpTest(r"\b,", ",", false);
+  assertRegExpTest(r"^\b,", ",", false);
+
+  assertRegExpTest(r"b\B", "b", false);
+  assertRegExpTest(r"b\B$", "b", false);
+  assertRegExpTest(r"\Bb", "b", false);
+  assertRegExpTest(r"^\Bb", "b", false);
+  assertRegExpTest(r",\B", ",", true);
+  assertRegExpTest(r",\B$", ",", true);
+  assertRegExpTest(r"\B,", ",", true);
+  assertRegExpTest(r"^\B,", ",", true);
+
+  assertRegExpTest(r"b\b", "b,", true);
+  assertRegExpTest(r"b\b", "ba", false);
+  assertRegExpTest(r"b\B", "b,", false);
+  assertRegExpTest(r"b\B", "ba", true);
+
+  assertRegExpTest(r"b\Bb", "bb", true);
+  assertRegExpTest(r"b\bb", "bb", false);
+
+  assertRegExpTest(r"b\b[,b]", "bb", false);
+  assertRegExpTest(r"b\B[,b]", "bb", true);
+  assertRegExpTest(r"b\b[,b]", "b,", true);
+  assertRegExpTest(r"b\B[,b]", "b,", false);
+
+  assertRegExpTest(r"[,b]\bb", "bb", false);
+  assertRegExpTest(r"[,b]\Bb", "bb", true);
+  assertRegExpTest(r"[,b]\bb", ",b", true);
+  assertRegExpTest(r"[,b]\Bb", ",b", false);
+
+  assertRegExpTest(r"[,b]\b[,b]", "bb", false);
+  assertRegExpTest(r"[,b]\B[,b]", "bb", true);
+  assertRegExpTest(r"[,b]\b[,b]", ",b", true);
+  assertRegExpTest(r"[,b]\B[,b]", ",b", false);
+  assertRegExpTest(r"[,b]\b[,b]", "b,", true);
+  assertRegExpTest(r"[,b]\B[,b]", "b,", false);
+
+  // Skipped tests from V8:
+
+  // Test that caching of result doesn't share result objects.
+  // More iterations increases the chance of hitting a GC.
+  
+  // Test that we perform the spec required conversions in the correct order.
+
+  // Check that properties of RegExp have the correct permissions.
+
+  // Check that end-anchored regexps are optimized correctly.
+  re = r"(?:a|bc)g$";
+  assertTrue("ag".contains(new RegExp(re)));
+  assertTrue("bcg".contains(new RegExp(re)));
+  assertTrue("abcg".contains(new RegExp(re)));
+  assertTrue("zimbag".contains(new RegExp(re)));
+  assertTrue("zimbcg".contains(new RegExp(re)));
+
+  assertFalse("g".contains(new RegExp(re)));
+  assertFalse("".contains(new RegExp(re)));
+
+  // Global regexp (non-zero start).
+  re = r"(?:a|bc)g$";
+  assertTrue("ag".contains(new RegExp(re)));
+  // Near start of string.
+  assertTrue(new RegExp(re).allMatches("zimbag", 1).isNotEmpty);
+  // At end of string.
+  assertTrue(new RegExp(re).allMatches("zimbag", 6).isEmpty);
+  5;  // Near end of string.
+  assertTrue(new RegExp(re).allMatches("zimbag", 5).isEmpty);
+  assertTrue(new RegExp(re).allMatches("zimbag", 4).isNotEmpty);
+
+  // Anchored at both ends.
+  re = r"^(?:a|bc)g$";
+  assertTrue("ag".contains(new RegExp(re)));
+  assertTrue(new RegExp(re).allMatches("ag", 1).isEmpty);
+  assertTrue(new RegExp(re).allMatches("zag", 1).isEmpty);
+
+  // Long max_length of RegExp.
+  re = r"VeryLongRegExp!{1,1000}$";
+  assertTrue("BahoolaVeryLongRegExp!!!!!!".contains(new RegExp(re)));
+  assertFalse("VeryLongRegExp".contains(new RegExp(re)));
+  assertFalse("!".contains(new RegExp(re)));
+
+  // End anchor inside disjunction.
+  re = r"(?:a$|bc$)";
+  assertTrue("a".contains(new RegExp(re)));
+  assertTrue("bc".contains(new RegExp(re)));
+  assertTrue("abc".contains(new RegExp(re)));
+  assertTrue("zimzamzumba".contains(new RegExp(re)));
+  assertTrue("zimzamzumbc".contains(new RegExp(re)));
+  assertFalse("c".contains(new RegExp(re)));
+  assertFalse("".contains(new RegExp(re)));
+
+  // Only partially anchored.
+  re = r"(?:a|bc$)";
+  assertTrue("a".contains(new RegExp(re)));
+  assertTrue("bc".contains(new RegExp(re)));
+  assertEquals("a", new RegExp(re).firstMatch("abc").group(0));
+  assertEquals(4, new RegExp(re).firstMatch("zimzamzumba").start);
+  assertEquals("bc", new RegExp(re).firstMatch("zimzomzumbc").group(0));
+  assertFalse("c".contains(new RegExp(re)));
+  assertFalse("".contains(new RegExp(re)));
+
+  // Valid syntax in ES5.
+  re = new RegExp("(?:x)*");
+  re = new RegExp("(x)*");
+
+  // Syntax extension relative to ES5, for matching JSC (and ES3).
+  // Shouldn't throw.
+  re = new RegExp("(?=x)*");
+  re = new RegExp("(?!x)*");
+
+  // Should throw. Shouldn't hit asserts in debug mode.
+  assertThrows(() => new RegExp('(*)'));
+  assertThrows(() => new RegExp('(?:*)'));
+  assertThrows(() => new RegExp('(?=*)'));
+  assertThrows(() => new RegExp('(?!*)'));
+
+  // Test trimmed regular expression for RegExp.test().
+  assertTrue("abc".contains(new RegExp(r".*abc")));
+  assertFalse("q".contains(new RegExp(r".*\d+")));
+
+  // Tests skipped from V8:
+  // Test that RegExp.prototype.toString() throws TypeError for
+  // incompatible receivers (ES5 section 15.10.6 and 15.10.6.4).
+}