What is a good regex for email validation?

^[a-zA-Z0-9._%+\-]+@[a-zA-Z0-9.\-]+\.[a-zA-Z]{2,}$ is a widely used practical pattern. It matches the vast majority of real email addresses and rejects clearly invalid ones.

Does this regex handle all valid email formats per RFC 5321?

No. A fully RFC-compliant email regex is extremely complex. This pattern handles 99%+ of real-world email addresses and is suitable for most web forms and validation needs.

Should I validate email with regex or with an email-sending test?

Regex catches formatting errors. The only way to fully verify an email address is to send a confirmation email and wait for the recipient to respond. Use both: regex for quick syntax checks, confirmation email for real validation.

Does this pattern work in Python?

Yes. Use it with Python's re module: import re; re.match(r'^[a-zA-Z0-9._%+\-]+@[a-zA-Z0-9.\-]+\.[a-zA-Z]{2,}$', email).

Does it support new TLDs like .photography or .io?

Yes. The {2,} quantifier on the TLD part matches any TLD of two or more characters, including long TLDs like .photography, .technology, or .io.

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Regex for Email Validation — Pattern, Explanation, and Live Test

Email validation is one of the most common regex tasks in web development. Below is a practical, production-tested regex pattern for email addresses, with a breakdown of each component — plus a live tester so you can verify it against your own email inputs before using it in your code.

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Production-tested email regex pattern provided

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Every part of the pattern explained

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Load the email validation pattern: ^[a-zA-Z0-9._%+\-]+@[a-zA-Z0-9.\-]+\.[a-zA-Z]{2,}$ — then test it against your email inputs to verify it accepts valid addresses and rejects invalid ones.

How It Works

Step-by-step guide to regex for email validation — pattern, explanation, and live test:

1
Use the recommended pattern
Start with: ^[a-zA-Z0-9._%+\-]+@[a-zA-Z0-9.\-]+\.[a-zA-Z]{2,}$
2
Understand the pattern
^[a-zA-Z0-9._%+\-]+ matches the local part (before @). @ matches the literal at sign. [a-zA-Z0-9.\-]+ matches the domain name. \.[a-zA-Z]{2,}$ matches the TLD (2 or more letters, like .com or .co.uk).
3
Test with valid inputs
Test with valid addresses like user@example.com, first.last@company.co.uk, and user+tag@subdomain.domain.org.
4
Test with invalid inputs
Test rejection of: missing @ (userexample.com), missing domain (user@), double dots (user@.com), and spaces (user @example.com).
5
Adapt if needed
For stricter validation, enforce maximum lengths. For lenient validation, allow more special characters in the local part.