iHateRegex

Don’t just use it. Understand it.

Regex without the
guesswork.

Test patterns, see their structure, document the tricky parts, and share a durable workspace with your team.

Start a regex Browse the library
email.regex
/[^@\s]+@[^@\s]+\.[^@\s]+/gm
[email protected]not-an-email[email protected]
2 matchesexit 0 · valid expression
See the structureBrowser-rendered railroad diagrams
Explain the whyNotes beside every pattern
Share a workspaceOne link your whole team can open
29 practical patterns

A library for the regex you actually write.

01

date

Matches a date in the format dd/mm/yyyy , dd-mm-yyyy or dd.mm.yyyy

$ pattern/(?:(?:31(\/|-|\.)(?:0?[13578]|1[02]))\1|(?:(?:29|30)(\/|-|\.)(?:0?[13-9]|1[0-2])\2))(?:(?:1[6-9]|[2-9]\d)?\d{2})$|^(?:29(\/|-|\.)0?2\3(?:(?:(?:1[6-9]|[2-9]\d)?(?:0[48]|[2468][048]|[13579][26])|(?:(?:16|[2468][048]|[3579][26])00))))$|^(?:0?[1-9]|1\d|2[0-8])(\/|-|\.)(?:(?:0?[1-9])|(?:1[0-2]))\4(?:(?:1[6-9]|[2-9]\d)?\d{2})/gm
datetodaydd/mm/yyyy