TempMailitoFree developer tool
Email regex tester
Test email validation patterns against sample strings before using them in forms, signup flows, or QA scripts.
Regex preview
Test email validation patterns
Check how your pattern behaves on sample strings before using it in forms or validation code.
Use with caution: no email regex is perfect. Pair this with disposable-domain checks and real verification flows.
When this helps
Use this tester while building signup forms, account settings, invite flows, CSV imports, and QA scripts that need basic email-format validation.
Validation checklist
- Keep regex validation simple and user-friendly.
- Send a confirmation email for real ownership checks.
- Use a disposable-domain checker when policy requires it.
- Test edge cases before shipping validation changes.
Related tools
TempMailito angle
Regex can validate format, but only a real inbox confirms delivery. Use temporary inboxes to test email verification and signup flows end to end.
Create temporary inboxFAQ
Email regex tester questions
Can one regex validate every real email address?
No. Email syntax is complex. A practical regex can catch obvious mistakes, but real verification still requires sending an email or confirmation code.
Should I block disposable email with regex?
No. Disposable-domain detection should use a domain list or dedicated checker, not only a regex pattern.
Does this tool store samples?
No. The tester runs in your browser and is intended for safe sample strings, not sensitive user data.