Regular Expressions 101

The BNF rules from RFC 5322 transformed to PCRE by Nikita Popov and described in the post http://nikic.github.io/2012/06/15/The-true-power-of-regular-expressions.html.

Matches distorted email addresses and converts them back to real ones.

Valid and Invalid emails

Use this regex to select all characters up to the "" bracket. It works across multiple lines. You can get an email list with only the IDs. This is the pattern it matches: Alpha Person Step 1 (.*) $ Step 2 [$.$ gives you aperson@whatever.org...

Replaces second to last but one characters in email with asterisks (@ and last . are protected): john.travolta@gmail.com > j*a@g**.m

Finds email addresses even when cleverly obfuscated in both english and hungarian

Picks out valid email addresses from string.

Working on email link cleanup.

It validates an email address with alias

Get Gmail tag, user and domain of an email address

A pattern to match the email domain suffix

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 @).