third_party/v8/test/mjsunit/regress/regress-1083450.js - cobalt - Git at Google

 // Copyright 2020 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.

 const source = "(?<=(?=ab)(|)abc)"
 const re = new RegExp(source);
 assertNotNull(re.exec("abc"));
	// Copyright 2020 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.

	const source = "(?<=(?=ab)(\|)abc)"
	const re = new RegExp(source);
	assertNotNull(re.exec("abc"));