Regex Tester
Processed locallyTest regular expressions against sample text. Supports all flags. Pattern library included.
About Regex Tester
The Regex Tester lets you test regular expressions against sample text. Toggle flags (global, case-insensitive, multiline, etc.) with checkboxes. Matches are highlighted inline; capturing groups are colour-coded. A built-in cheatsheet shows common patterns, anchors, and quantifiers. The pattern library includes ready-to-use regexes for email, URLs, phone numbers, and more. Test your patterns in real time as you type. All processing runs in your browser—no server calls, no rate limits. Essential for developers writing validation logic, search features, or text parsers. Debug complex patterns before adding them to your code.