How to get email address from a long string

Question

In PHP, I have a string like this:

$string = \"user@domain.com MIME-Version: bla bla bla\";

How do i get the email address only? Is there a

Answer 1

based from constantine regex.. works with ip address domain too.

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

//$pattern="/[A-Za-z0-9_-]+@[A-Za-z0-9_-]+\.([A-Za-z0-9_-][A-Za-z0-9_]+)/";

$subject="Hello a@b.com francis a@b words francisfueconcillo@gmail.com words 2 words123 francis@192.168.0.1";


preg_match_all($pattern, $subject, $matches);