Yes, completely free with no signup required.

Does my data leave my device?

No. Everything runs in your browser — nothing is sent to any server.

Does it work on mobile?

Yes. The tool is mobile-first and works on any modern browser including iOS Safari and Android Chrome.

Quick reference for regular expressions. Click any pattern to copy it, then test in the live tester below.

100% client-side · no upload

Pattern	Group	Description	Example

Click any row to copy the pattern to your clipboard.

Pattern Flags

Test string

Browse the cheat sheet or type in the search box to filter patterns by name or symbol.
Click any pattern in the table to copy it to your clipboard.
Paste a pattern and test string in the tester at the bottom to verify your expression.

Is this tool free?: Yes, completely free with no signup required.
Does my data leave my device?: No. Everything runs in your browser — nothing is sent to any server.
Does it work on mobile?: Yes. The tool is mobile-first and works on any modern browser including iOS Safari and Android Chrome.