About this tool
This free regex tester runs a JavaScript regular expression against your text and highlights every match as you type — with a match count and the capture groups from the first match. Toggle the common flags (global, ignore case, multiline, dotall) with a click.
Everything runs in your browser — nothing is uploaded.
Features
- Live match highlighting as you type
- Flags: global (g), ignore case (i), multiline (m), dotall (s)
- Match count and capture groups
- Clear error message for an invalid pattern
How to use it
- Enter a pattern between the slashes
- Choose flags — or type them directly
- Paste your test text — matches highlight instantly
- Read the results — match count and capture groups below