Regex Tester: Test and Debug Regular Expressions

Validate, test, and debug regular expressions (regex) instantly. Powerful regex tester for developers with match highlighting, flags, and cheat sheet. Works offline.

Features:

Instant Regex Validation & Testing

Instantly validate and test your regular expressions against sample or pasted text. See all matches, groups, and indices in real time.

Regex Flags & Cheat Sheet

Toggle regex flags (global, multiline, insensitive, etc) and access a built-in regex cheat sheet for quick reference.

Match Highlighting & Debugging

Visualize all matches and capture groups directly in your text. Debug complex patterns with ease.

Offline & Private

All validation and testing happens locally in your browser. Your data never leaves your device.