$re = '/(\w+)=([\w\s]+)(?=[,\s]+)/';
$str = 'Ob=Web technology,OB=Product SPe,OB=Dev profile,OB=Computer Management,oB=Hardware Services,cd=sti,CD=com,cd=ws
Ob=Web technology,OB=Product SPe,OB=Dev profile,OB=Computer Management,oB=Hardware Services,cd=sti,CD=com,cd=ws
Ob=Web technology,OB=Product SPe,OB=Dev profile,OB=Computer Management,oB=Hardware Services,cd=sti,CD=com,cd=ws
Ob=Web technology,OB=Product SPe,OB=Dev profile,OB=Computer Management,oB=Hardware Services,cd=sti,CD=com,cd=ws
';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
// Print the entire match result
var_dump($matches);
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php