Regex Tester

Test regular expressions against sample text with live match highlighting, group capture tables and common pattern reference. Supports all JavaScript regex flags.

100% free No uploads Runs in your browser No signup

Regex tester

Pattern

6 matches found

Flags

Test text

The quick brown fox jumps over 42 lazy dogs at 3:14 PM on 2025-09-09. Email: fox@example.com Not an email: fox@

Cheat sheet

Uses your browser's native JavaScript regex engine (same as String.prototype.match). Flag cheats: g = all matches, i = ignore case, m = ^ and $ per line, s = dot matches newlines, u = unicode. Click any cheat-sheet token to load it into the pattern field.

How to use the Regex Tester

1
Open the tool above — it is already running, no install or account needed.
2
Enter your input and adjust the options to match what you need.
3
Copy or download the result — everything was processed locally in your browser.

Private by design

This tool runs 100% inside your own browser using local JavaScript — your input never touches a server. That makes it instant, offline-capable in many cases, and private even for sensitive data.

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