Regex Tester
Professional Developer Tool

Build & Test Expressions

Design and validate your regular expressions with real-time feedback. Fast, secure, and entirely client-side.

//gm
Highlighted Preview
contact@example.com
support@domain.org
hello.world@sub.provider.net
invalid-email@com
UTF-885 chars
Matches Found3
Match 1
contact@example.com
Group 1: contactGroup 2: exampleGroup 3: com
@0
Match 2
support@domain.org
Group 1: supportGroup 2: domainGroup 3: org
@20
Match 3
hello.world@sub.provider.net
Group 1: hello.worldGroup 2: sub.providerGroup 3: net
@39
Real-time Testing

Instantly test your patterns and see match results with capture groups highlighted.

100% Private

All regex processing happens in your browser. No data is sent to any server.

JavaScript Flavour

Uses the native JavaScript RegExp engine — perfect for web developers.

About This Regex Tester

The Draskenlabs Regex Tester is a professional, client-side regular expression tool built for developers. Test regex patterns against any string, inspect capture groups, toggle flags like global, multiline, and case insensitive, and get instant highlighted match feedback — all without leaving your browser.

Regular expressions (regex or regexp) are sequences of characters that define search patterns. They are widely used in form validation, text parsing, search and replace operations, and data extraction. This tool supports the full JavaScript ECMAScript RegExp specification including lookaheads, lookbehinds, named capture groups, and unicode flags.