Developer Tools
Regex Library
Vetted, ready-to-copy regular expressions for common formats.
Loading interactive tool...
About this tool
A curated library of regular expressions for things you need every week — emails, URLs, IPs, UUIDs, JWTs, phone numbers, ISO dates, hex colors, and more. Click to copy; hop to the Regex Tester to validate against your data.
Frequently asked questions
How are these patterns chosen?
We pick patterns that are practical rather than perfect. RFC-perfect patterns (e.g. for emails) are huge and brittle; the patterns here cover real-world inputs while staying readable.
Will these work in other languages?
Most do — they use ECMAScript syntax which overlaps heavily with PCRE, Python's `re`, and .NET. Look-behind and named groups can vary.