RegEx email parser

Split email formats in pieces through preg_match:

$str=' (|(([^a-zA-Z0-9_\-.]|)(.*?)(|[^a-zA-Z0-9_\-.]+?)([a-zA-Z0-9_\-.]+?)(|[^a-zA-Z0-9_\-.]+?)))(|[^a-zA-Z0-9_\-.])([a-zA-Z0-9_\-.]+?)(|[^a-zA-Z0-9_\-.])@(.+?)\.([^>]+)';

Version #2:

if (preg_match('/^[^\W][a-zA-Z0-9_\.\-]+(\.[a-zA-Z0-9_\-]+)*\@[a-zA-Z0-9_\-]+(\.[a-zA-Z0-9_\-]+)*\.[a-zA-Z]{2,4}$/',$item['email'])) {
...
}