Free Online Regex Tester & Matcher

Test and debug regular expressions with live syntax highlighting and capture groups.

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Client-Side Guarantee: Processed 100% locally in your browser. No files or data are uploaded.

How to Use the Regex Tester

  1. Enter your regular expression and flags.
  2. Paste your test string in the text area.
  3. Review highlighted matches and capture groups.

Key Features

✓ Real-time pattern evaluation
✓ Capture group extraction table
✓ Interactive flag toggles (g, i, m, s)
✓ Common regex pattern cheatsheet

About Regex Tester

Test JavaScript regular expressions against sample text with real-time match highlighting, capture group extraction, and flag toggles (g, i, m, s, u).

Frequently Asked Questions

Which regex flavor does this tool use?

It runs the standard ECMAScript / JavaScript regular expression engine built into modern browsers.

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