https://takao.blog/en/tags/regex/Recent content in Regex on Commentary of TakaoHugo -- gohugo.ioenCommentary of TakaoSat, 13 Jun 2026 23:11:50 +0900https://takao.blog/en/web/js-regex-v-flag/Wed, 15 Oct 2025 00:00:00 +0900https://takao.blog/en/web/js-regex-v-flag/<img src="https://takao.blog/img/thumnail.webp" alt="Featured image of post Unlocking JavaScript RegExp Power with the v Flag" /><h2 id="introduction">Introduction </h2><p>Regular expressions in JavaScript have evolved significantly. ES2024 introduces the <strong><code>v</code> flag</strong> — a superset of the <code>u</code> flag that unlocks powerful set notation, character class subtraction, intersection, and proper Unicode emoji matching. If you&rsquo;ve struggled with complex character class logic or emoji regex patterns, the <code>v</code> flag is a game-changer.</p> <hr> <h2 id="what-is-the-v-flag">What Is the v Flag? </h2><p>The <code>v</code> flag replaces and extends the <code>u</code> (unicode) flag. Enable it by appending <code>v</code> to your regex:</p>