100% local processing - your files and data never leave your browser.
No accounts, no tracking - we don't save your credentials, files, or usage.
Free forever - donations are welcomed, but every tool is and always will be free.
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FREE TOOL - LIVE MATCHES - NO UPLOAD

REGEX
TESTER

Write JavaScript regular expressions, test flags, inspect capture groups, and preview replacements live.

Test Regex - Free All 114 Tools
/[a-z]+@\w+\.\w+/gi2 matchesgroups detected
Live Matching
Matches update as you type.
Regex Flags
Use g, i, m, s, u, and y flags.
Capture Groups
Inspect group values for each match.
Replacement
Preview replace output instantly.
JavaScript Regex
Uses the browser RegExp engine.
Private
All text stays local.
The Tool

TEST REGEX

regex.php - readyLIVE

Matches

Replace Preview

Ready.
Process

HOW IT WORKS

Enter a pattern, flags, and sample text.

01
Write pattern
Use JavaScript regex syntax.
02
Check matches
See match indexes and groups.
03
Preview replace
Test replacement strings safely.
FAQ

COMMON QUESTIONS

The tool uses JavaScript regular expressions.

No. Matching happens locally in your browser.

Yes. Captured values appear under each match.

Yes. Use the replacement field for live replace previews.

JavaScript flags like g, i, m, s, u, and y.

The UI limits display to keep the browser responsive.
Accent colour
Custom