Development Tool
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Regex
Tester
Test regular expressions dynamically against any text. Matches are highlighted instantly as you type. All processing runs entirely in your browser — private and secure.
// Total Uses
175
and counting
// Engine
JS
ECMAScript RegExp
regex-tester.js
LIVE
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§ Specs
Quick Reference
Common Flags
g - Global match (find all matches rather than stopping after the first
match)i - Ignore case (case-insensitive matching)m - Multiline (^ and $ match start/end of line)
Security & Processing
This tool uses the JavaScript RegExp engine running locally in your
browser. All inputs, patterns, and texts stay strictly on your device.
? FAQ
Frequently Asked Questions
This tool runs directly in your browser and uses the JavaScript (ECMAScript) regular expression engine. Syntax and behavior strictly follow modern JS standards.
g (global): Matches all occurrences instead of stopping after the first match. i (ignore case): Matches both uppercase and lowercase letters. m (multiline): Makes the start
^ and end $ anchors match the beginning and end of each line, rather than the whole string.No, all pattern matching is performed locally within your device's browser. This guarantees your test strings and regular expressions remain completely private.