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

If it's really space-separated:

php > $matches = array();
php > preg_match('/^[^ ]*/', $string, $matches);
php > print_r($matches[0]);
user@domain.com