Regex Tester & Debugger - Test Regular Expressions Online

Test, debug, and validate Regular Expressions online in real-time. Features interactive match highlighting, capture group inspection, and cheat-sheet presets.

.*Regex Tester & Debugger

Test, debug, and validate Regular Expressions in real-time with capture groups and preset cheat sheets.

//
Test String4 matches found
Hello team! Please contact support@textsflix.com or alex.dev@startup.io for any questions. You can also reach out to info@example.org or sales-dept@cloud.co.uk.
Match Details & Capture Groups
Match #1Index: 27 - 48 (21 chars)
support@textsflix.com
Match #2Index: 52 - 71 (19 chars)
alex.dev@startup.io
Match #3Index: 117 - 133 (16 chars)
info@example.org
Match #4Index: 137 - 159 (22 chars)
sales-dept@cloud.co.uk

Common Regex Presets

Click any pattern below to load it with a sample test string.

Quick Reference

\d Digit [0-9]
\w Word [a-zA-Z0-9_]
\s Whitespace
. Any character
^ / $ Start / End
* / + / ? 0+, 1+, 0 or 1

⚡ Real-Time Regex Tester & Debugger with Capture Groups

Regular expressions can be difficult to construct and debug. Our Regex Tester & Debugger allows you to test patterns against text in real time with live color-coded match highlighting.

Inspect capture groups, toggle regex flags (g, i, m, s, u), and review detailed match indices. Explore our built-in cheat sheet with pre-configured patterns for email validation, URLs, IPv4 addresses, phone numbers, and dates.

Works 100% client-side in your browser for instant feedback without sending any test strings over the network.

Give your text a unique twist with our free online tools, including Bold /Italic Font Maker.