Regex Generator
Turn a description into a regular expression, in the flavour your language uses.
- JavaScript, Python, PCRE, Java, grep
- Free to use
Test the pattern against your own data before relying on it. Regular expressions fail in ways that are not obvious from reading them.
Uses one AI credit. Nothing is charged if the request fails.
The result will appear here.
Questions about regex generator
Why does it ask which flavour?
Because they genuinely differ. A lookbehind that works in Python fails in older JavaScript, and POSIX ERE has no non-greedy quantifier at all. A pattern generated for the wrong flavour looks right and fails on paste.
Can I trust the pattern?
Test it against your own data first. Regular expressions fail in ways that are not visible from reading them — particularly on the inputs you did not think of.
Do I need an account?
Yes, for the AI tools. Credits are counted per account, so there is no way to meter an anonymous visitor — and an unmetered path would exhaust the model budget within a day. Signing in is free and the free plan includes credits.
Is my text stored?
Your text is sent to the model to be processed and is not saved to your account unless you choose to save the result. Identical requests are cached for a day so a repeat costs nothing, which is why the same input can return instantly.
What happens if it fails?
The credit is refunded. A request that returned nothing does not cost you anything.
Can I use the output commercially?
Yes. Check it first — a language model can be confidently wrong, and anything factual should be verified before you put your name on it.
Something wrong with this tool?
If it gave you the wrong answer or would not do what you needed, we would rather hear about it than not.
Tell us what happened