regex - PHP Regexp header (session id) -

i have following code :

$html = get_data($url); 

i want extract session id code, has following form :

phpsessid=aaabbb123456789;

i'd store session id (only id) in var. use regexp :

preg_match('#phpsessid=(.+?);#is', $html, $result); 

i want, $result tab contains 2 strings. here var_dump():

array(2) { [0]=> string(37) "phpsessid=aaabbb123456789;" [1]=> string(26) "aaabbb123456789" }  

i preg_match() return id, in $result[1]. should change in regexp ?

thanks

the result list of regex matches has first result being entire string. php's preg_match() guarantees well:

if matches provided, filled results of search. $matches[0] contain text matched full pattern, $matches[1] have text matched first captured parenthesized subpattern, , on.

so can safely extract value $result[1] without worrying might change , cause warning.