tests/corelib_2/regexp/alternatives_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 regular expression processing with alternatives.');

  var s1 = "<p>content</p>";
  shouldBe(firstMatch(s1, new RegExp(r"<((\\/([^>]+)>)|(([^>]+)>))")),
      ["<p>", "p>", null, null, "p>", "p"]);
  shouldBe(firstMatch(s1, new RegExp(r"<((ABC>)|(\\/([^>]+)>)|(([^>]+)>))")),
      ["<p>", "p>", null, null, null, "p>", "p"]);
  shouldBe(firstMatch(s1, new RegExp(r"<(a|\\/p|.+?)>")), ["<p>", "p"]);

  // Force YARR to use Interpreter by using iterative parentheses
  shouldBe(firstMatch(s1, new RegExp(r"<((\\/([^>]+)>)|((([^>])+)>))")),
      ["<p>", "p>", null, null, "p>", "p", "p"]);
  shouldBe(firstMatch(s1, new RegExp(r"<((ABC>)|(\\/([^>]+)>)|((([^>])+)>))")),
      ["<p>", "p>", null, null, null, "p>", "p", "p"]);
  shouldBe(firstMatch(s1, new RegExp(r"<(a|\\/p|(.)+?)>")), ["<p>", "p", "p"]);

  // Force YARR to use Interpreter by using backreference
  var s2 = "<p>p</p>";
  shouldBe(firstMatch(s2, new RegExp(r"<((\\/([^>]+)>)|(([^>]+)>))\5")),
      ["<p>p", "p>", null, null, "p>", "p"]);
  shouldBe(firstMatch(s2, new RegExp(r"<((ABC>)|(\\/([^>]+)>)|(([^>]+)>))\6")),
      ["<p>p", "p>", null, null, null, "p>", "p"]);
  shouldBe(firstMatch(s2, new RegExp(r"<(a|\\/p|.+?)>\1")), ["<p>p", "p"]);
}