tests/corelib_2/regexp/backreferences_test.dart

// Copyright (c) 2014, the Dart project authors. All rights reserved.
// Copyright 2013 the V8 project authors. All rights reserved.
// Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
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import 'v8_regexp_utils.dart';
import 'package:expect/expect.dart';

void main() {
  description(
      "Test to ensure correct behaviour when using backreferences in a RegExp");

  shouldBeTrue(new RegExp(r"(...)\1$").hasMatch('abcabc'));
  shouldBeFalse(new RegExp(r"(...)\1$").hasMatch('abcdef'));
  shouldBeFalse(new RegExp(r"(...)\2$").hasMatch('abcabc'));
  shouldBeFalse(new RegExp(r"(...)\2$").hasMatch('abc'));
  shouldBeTrue(new RegExp(r"\1(...)$").hasMatch('abcabc'));
  shouldBeTrue(new RegExp(r"\1(...)$").hasMatch('abcdef'));
  shouldBeFalse(new RegExp(r"\2(...)$").hasMatch('abcabc'));
  shouldBeFalse(new RegExp(r"\2(...)$").hasMatch('abc'));
  shouldBeTrue(new RegExp(r"\1?(...)$").hasMatch('abc'));
  shouldBeTrue(new RegExp(r"\1?(...)$").hasMatch('abc'));

  var re = new RegExp(r"[^b]*((..)|(\2))+Sz", caseSensitive: false);

  shouldBeFalse(re.hasMatch('axabcd'));
  shouldBeTrue(re.hasMatch('axabcsz'));
}