Natural language → regex

AI

Describe the text you want to match or validate. You'll get a suggested JavaScript-style pattern, flags, and short technical notes. Always test in the Regex tester before using on untrusted input.

Describe the match

?
Write in English. The model suggests a JavaScript RegExp pattern and flags. Always test edge cases in the Regex tester—patterns can be wrong or unsafe for untrusted input.
Regex tester

Common use cases

  • Turn a fuzzy English description into a starting JavaScript RegExp and flags.
  • Explore alternative phrasings when your first pattern misses edge cases.
  • Document what a legacy regex was trying to do for teammates who think in prose.

Common mistakes to avoid

  • Deploying untested patterns on untrusted input

    Regex can be catastrophic or wrong. Always test in the Regex tester and consider limits in your runtime.

  • Assuming dialect matches Python, PCRE, or RE2

    Output targets JavaScript-style regex. Translate carefully for other engines.

FAQ

Is pattern generation server-assisted?

When configured, your description may be processed remotely—avoid sensitive examples.

Should I still learn regex syntax?

Yes. Explanations help, but maintenance and security reviews need human understanding of the final pattern.

More tools

Related utilities you can open in another tab—mostly client-side.