RegEx for RFC 2822 compliant email address.

email-regex.md

Complete version

(?:[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*|"(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21\x23-\x5b\x5d-\x7f]|\\[\ x01-\x09\x0b\x0c\x0e-\x7f])*")@(?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?|\[(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?|[a-z0-9-]*[a-z0-9]:(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21-\x5a\x53-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])+)\])

Simpler version

[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?

Sources

• RFC: http://tools.ietf.org/html/rfc2822#section-3.4.1
• RegEx: http://www.regular-expressions.info/email.html

There's a space that breaks complete regex version - [\ x01

Error in link RegEx email.htlm -> email.html

The complete version doesn't work. You can copy and try yourself.

The complete version I try on regex101.com and I need to escape the / char

/[a-z0-9!#$%&'*+\/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+\/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?/g

now works :)

@sonyarianto you don't have to modify anything, just choose the right option:

@kuriel-trivu
Where can I get access to those different flavours?
You got a url?

@ZiiSolutions try this one here https://regex101.com/

To support upper-case in the email regex a-z should be replaced with a-zA-Z

The referred article https://www.regular-expressions.info/email.html suggests

This regex is intended to be used with your regex engine’s “case insensitive” option turned on

It should be mentioned at the top of this page