Regular Expressions 101

Match any email, according to the grammer in RFC 5322, found at http://tools.ietf.org/html/rfc5322

Validates most email addresses. Using the range [A-Za-z0-9] at the beginning instead of \w means an address cannot begin with an underscore. This range is also used to exclude underscores from the domain (part after @).

Use this Regex for server-side validation also with some slight modifications like so for .NET -- @\w+(-+.']\w+)@\w+([-.]\w+)\.[a-zA-Z0-9]{2,6}([-.{2,6})*;

True if user input mobile phone or email

Validates all possible emails with western and cyrilic chars.

Get Gmail tag, user and domain of an email address. -- Fixed the bug that the label doesn't match if there are an dot on user.

get ip identifier, queue name, email domain and status from postfix log

Does not match everything, but good for a cross-platform validation filter.

Email validator from http://haacked.com/archive/2007/08/21/i-knew-how-to-validate-an-email-address-until-i.aspx/

Unsatisfied with your email validation? Concerned about standards compliance? Worried about that one weird edge case? Want to stress-test your regex engine? This might be the regex for you!

Get Gmail tag, user and domain of an email address. -- Fixed the bug that the label be obligatory

Validate multiple Email-addresses separated by semicolon. No check on allowed domains, just a plain and simple check on the correct structure

infinite emails with ; separator a@b.c;a@b.c;a@b.c;a@b.c;a@b.c

to check email bunch with commas

because everything else is too strict

Supports new top level domains, such as .plumbers .blackfriday