Regex Tester
Test regular expressions live - highlight matches, inspect capture groups and preview replacements. Runs in your browser.
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What is a Regex Tester?
A regular expression (regex) is a pattern used to search and manipulate text. This tester lets you build a pattern, toggle flags, and instantly see what it matches in your sample text, inspect the capture groups, and preview a find-and-replace - all evaluated locally in your browser using JavaScript's RegExp engine.
How to use it
- 1. Type your pattern and choose flags (global, ignore case, multiline, …).
- 2. Enter a test string - matches are highlighted live and listed with their groups.
- 3. Add a replacement (with
$1,$2,$&) to preview the result.
