How does the Regex Tester & Debugger work?

Test, debug, and evaluate regular expressions in real-time with capture group extraction, match counts, and common regex templates. 100% private in-browser tool. All processing takes place locally inside your web browser with 100% mathematical precision.

Is this tool free and private?

Yes, this tool is 100% free with no registration, no watermarks, and zero server uploads. Your data never leaves your device.

Can I use this tool on mobile devices?

Yes, Regex Tester & Debugger is fully responsive and optimized for all modern Android, iOS, tablet, and desktop web browsers.

JAVASCRIPT REGEXP ENGINE · LIVE MATCH

Regex Tester & Debugger

Test regular expressions against multiline text with color-coded capture groups, match counters, and instant templates.

REGULAR EXPRESSION PATTERN

Quick Template:

/ /

TEST STRING 0 matches found

Matched Results & Capture Groups

#	Full Match	Index	Groups
No matches found