mirror of
https://github.com/nodejs/node.git
synced 2025-05-15 17:51:35 +00:00
d8c97e4857
PR-URL: https://github.com/nodejs/node/pull/50115 Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com> Reviewed-By: Michael Dawson <midawson@redhat.com>
31 lines
1.0 KiB
JavaScript
31 lines
1.0 KiB
JavaScript
// Copyright 2023 the V8 project authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style license that can be
|
|
// found in the LICENSE file.
|
|
|
|
// Flags: --enable-experimental-regexp-engine
|
|
// Flags: --no-default-to-experimental-regexp-engine
|
|
|
|
// An example where the Experimental regexp engine
|
|
// used to disagree with the backtracking engine and the specification
|
|
// for nullable quantifiers.
|
|
// v8:14098
|
|
var str = "ab";
|
|
|
|
// executed by the Experimental engine (l flag)
|
|
var exp_repetitions = /(?:a?b??){0,2}/l;
|
|
var exp_empty_star = /(?:a?b??)*/l;
|
|
|
|
// executed by the backtracking engine
|
|
var bt_empty_star = /(?:a?b??)*/;
|
|
|
|
// The engines should both match "ab":
|
|
// The first star repetition should match 'a'
|
|
// because ignoring 'b' has highest-priority.
|
|
// Then the greedy star should be entered again.
|
|
// Then the second repetition should match 'b',
|
|
// a non-empty repetition of the star.
|
|
|
|
assertEquals(["ab"], bt_empty_star.exec(str));
|
|
assertEquals(['ab'], exp_empty_star.exec(str));
|
|
assertEquals(['ab'], exp_repetitions.exec(str));
|