Email Regex
A practical email validation regex, tested against valid and invalid addresses, with code snippets. Free and private: runs in your browser.
Paste addresses (one per line) to test them against the same rule browsers use for type="email".
Runs entirely in your browser. Nothing you paste is uploaded or stored.
Use cases
- Find a syntax error before the build or deploy fails.
- Check config files in code review.
- Learn the rules your linter enforces.
Frequently asked questions
Why does my regex reject valid emails?
Common mistakes are forbidding + in the local part, limiting TLDs to 2–4 letters, or rejecting subdomains. This pattern allows all of those.
Is the Email Regex free?
Yes. It is free with no sign-up, and it runs entirely in your browser, so your input is never uploaded or stored.
What should I do with the issues it reports?
Fix high-severity items first; they usually break builds or deployments. Lower-severity items are style and best-practice suggestions.
Related tools
Checking one snippet is a start. Scan your whole repository for free with CodeInspector.