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c7b3292251
PR-URL: https://github.com/nodejs/node/pull/36139 Reviewed-By: Jiawen Geng <technicalcute@gmail.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Myles Borins <myles.borins@gmail.com> Reviewed-By: Shelley Vohr <codebytere@gmail.com>
33 lines
1.1 KiB
JavaScript
33 lines
1.1 KiB
JavaScript
// Copyright 2019 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Flags: --allow-natives-syntax --no-enable-experimental-regexp-engine
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// Flags: --no-enable-experimental-regexp-engine-on-excessive-backtracks
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const kNoBacktrackLimit = 0; // To match JSRegExp::kNoBacktrackLimit.
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const re0 = %NewRegExpWithBacktrackLimit("(\\d+)+x", "", kNoBacktrackLimit);
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const re1 = %NewRegExpWithBacktrackLimit("(\\d+)+x", "", 50);
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// Backtracks remain below the limit on this subject string.
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{
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let s = "3333ax3333x";
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assertArrayEquals(["3333x", "3333"], re0.exec(s));
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assertEquals(["3333x", "3333"], re1.exec(s));
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}
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// A longer subject exceeds the limit.
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{
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let s = "333333333ax3333x";
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assertArrayEquals(["3333x", "3333"], re0.exec(s));
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assertEquals(null, re1.exec(s));
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}
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// ATOM regexp construction with a limit; in this case the limit should just be
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// ignored, ATOMs never backtrack.
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{
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const re = %NewRegExpWithBacktrackLimit("ax", "", 50);
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let s = "3333ax3333x";
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assertArrayEquals(["ax"], re.exec(s));
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}
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