Free Tool

Regex Tester

Test a regular expression against your text, with every match highlighted. Sizes are capped so a bad pattern can't hang the page.

Runs entirely in your browser. Nothing you type on this page is sent to any server, stored, or tracked. Close the tab and it is gone.

Pattern

Global (g) Case-insensitive (i) Multiline (m)

Test text (max 50,000 characters)

Patterns are capped at 500 characters and test text at 50,000 characters, and matches stop at 200. Very complex patterns on long text can still be slow — keep test text short for tricky patterns.