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[regexp-escape] Implement and stage RegExp.escape #4399

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[regexp-escape] Implement and stage RegExp.escape #4399

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9 changes: 9 additions & 0 deletions test/staging/built-ins/RegExp/escape/surrogate-pair.js
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// Copyright (C) 2025 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
description: Unescaped surrogate pairs
features: [RegExp.escape]
---*/

assert.sameValue(RegExp.escape("\ud800\udc00"), "\ud800\udc00", 'Unescaped surrogate pair');