Regex Generator
Pick a common pattern or build one from simple options, then test it right away.
Common patterns
Or build your own
● Your files are processed locally in your browser and are not uploaded to our servers.
How it works
The library contains carefully tested JavaScript patterns for common formats, each with matching and non-matching examples. The builder creates a character class from what you allow, plus length limits. Every line of the test box is checked as you type.
FAQ
Is the email regex perfect?
No regex fully implements the email standard; the one provided accepts realistic addresses and rejects obvious mistakes. Always confirm emails by sending a message.