Regex Tester Online — Free Regular Expression Tester

Pattern

/ /

Flags: g global i case-insensitive m multiline s dot-all

Try: email URL IPv4 date #hex words digits groups

Test String

Highlighted Matches

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How to use this regex tester

Type your pattern and test string — matches highlight instantly. No button press needed. Uses JavaScript's native RegExp engine.

Use (…) for numbered groups or (?<name>…) for named groups. All captured values are shown in the table below the result.

g finds all matches. i ignores case. m makes ^/$ match line starts/ends. s makes . match newlines.

No server, no uploads, no analytics on your data. All regex processing runs in your browser with pure JavaScript. Your strings stay yours.

Click any chip in the "Try:" row to load a common pattern and sample text. Great starting point for email, URL, date, or IP validation.

Uncheck the g flag to find only the first match. Useful when you just need to validate whether something matches at all.

Quick Reference