Toolwise

Regex Tester

Write and test regular expressions with real-time match highlighting and capture group details.

How to use Regex Tester

  1. 1Type your regular expression pattern and select flags (g, i, m, etc.).
  2. 2Paste your test text below.
  3. 3Matches are highlighted instantly, with capture groups listed underneath.

About Regex Tester

This tool lets you write a JavaScript-flavoured regular expression and test it against sample text in real time, highlighting every match and listing capture groups.

Benefits

  • • Debug complex regular expressions visually instead of guessing.
  • • See exactly which parts of your text match, and what each capture group contains.

Common mistakes

  • • Forgetting the global flag (g), which means only the first match is found instead of all matches.
  • • Not escaping special characters like `.` or `(` when they're meant to be literal.

Frequently Asked Questions

This tool uses standard JavaScript regular expression syntax, the same engine used in browsers and Node.js.

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