tests/corelib_2/regexp/non-capturing-groups_test.dart

// Copyright (c) 2014, the Dart project authors. All rights reserved.
// Copyright 2013 the V8 project authors. All rights reserved.
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import 'v8_regexp_utils.dart';
import 'package:expect/expect.dart';

void main() {
  description(
      'Test for behavior of non-capturing groups, as described in <a href="http://blog.stevenlevithan.com/archives/npcg-javascript">' +
          'a blog post by Steven Levithan</a> and <a href="http://bugs.webkit.org/show_bug.cgi?id=14931">bug 14931</a>.');

  shouldBeTrue(new RegExp(r"(x)?\1y").hasMatch("y"));
  shouldBe(new RegExp(r"(x)?\1y").firstMatch("y"), ["y", null]);
  shouldBe(new RegExp(r"(x)?y").firstMatch("y"), ["y", null]);
  shouldBe(firstMatch("y", new RegExp(r"(x)?\1y")), ["y", null]);
  shouldBe(firstMatch("y", new RegExp(r"(x)?y")), ["y", null]);
  shouldBe(firstMatch("y", new RegExp(r"(x)?\1y")), ["y", null]);
  Expect.listEquals("y".split(new RegExp(r"(x)?\1y")), ["", ""]);
  Expect.listEquals("y".split(new RegExp(r"(x)?y")), ["", ""]);
  assertEquals("y".indexOf(new RegExp(r"(x)?\1y")), 0);
  assertEquals("y".replaceAll(new RegExp(r"(x)?\1y"), "z"), "z");
  assertEquals(
      "y".replaceAllMapped(new RegExp(r"(x)?y"), (m) => m.group(1)), "null");
  assertEquals(
      "y".replaceAllMapped(new RegExp(r"(x)?\1y"), (m) => m.group(1)), "null");
  assertEquals(
      "y".replaceAllMapped(new RegExp(r"(x)?y"), (m) => m.group(1)), "null");
}