Regex Tester
Live highlighting, common patterns library
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Matches
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Quick guide
What can Regex Tester help you do?
Free online regex tester. Live match highlighting, supports g/i/m/s/u flags. Common patterns included.
Best for
Useful for quick file work, text cleanup, calculations, content creation, and website or AI checks.
How to use it
Open the tool, enter or upload what it asks for, then copy or download the result directly.
Privacy and limits
Most tools run in your browser with no sign-in. Very large files or older devices may hit browser memory limits.
Frequently Asked Questions
Is this JavaScript regex?
Yes — ECMAScript engine. May differ slightly from Python/Perl regex.