// Dev Tool

REGEX TESTER

Live regular-expression testing with match highlighting, capture groups, replace output, and a built-in pattern library. Works entirely in your browser — nothing is sent anywhere.

Enter a pattern and test string to begin.

Pattern REGEXP

/ /

No pattern

Test String

Matches & Captured Groups

Run a match to see capture groups here.

Replacement String

Output

Enter a pattern, test string, and replacement to see output.

Select a pattern to preview it here.