Common Regex Library (Email, URL, IP, Phone, Date)

Stop reinventing the email regex (and getting it wrong). This library has battle-tested patterns for the things you actually need to validate — email, URL, IP addresses, phone numbers, dates, credit cards, ISBN, hex colors — with example matches and copy-paste-ready syntax for JavaScript, Python, PCRE, and POSIX flavors.

How to use the Common Regex Library (Email, URL, IP, Phone, Date)

Search by keyword (email, url, ip, date, currency). Click Copy on any pattern to copy it. The "test" input runs your string against every visible pattern — green badge if it matches, gray if not.