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deps/v8/test/mjsunit/regexp-14098.js

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+// 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));