php - Correct regex to detect font family names from google font link src -

i've been trying array of fonts i'm enqeueing on wordpress theme. testing.

on input:

http://fonts.googleapis.com/css?family=arimo:400,700|quicksand:400,700|cantarell:400,700,400italic,700italic|muli:300,400,300italic,400italic|roboto+slab:400,700|share:400,700,400italic,700italic|inconsolata:400,700|karla:400,700,400italic,700italic|maven+pro:400,500,700,900|roboto+slab:400,700|open+sans:400italic,600italic,700italic,400,600,700 

what need on output this:

array( [0] => 'arimo', [1] => 'quicksand', [2] => 'cantarell', ... on ) 

till now, have done 1 little problem.

my code:

$input = 'http://fonts.googleapis.com/css?family=arimo:400,700|quicksand:400,700|cantarell:400,700,400italic,700italic|muli:300,400,300italic,400italic|roboto+slab:400,700|share:400,700,400italic,700italic|inconsolata:400,700|karla:400,700,400italic,700italic|maven+pro:400,500,700,900|roboto+slab:400,700|open+sans:400italic,600italic,700italic,400,600,700';  $against = "/[a-z][a-z]+[\+][a-z][a-z]+|[a-z][a-z]+/";  $matches = array()  preg_match_all( $against, $input, $matches );  print_r($matches); 

from this, output this:

array( 0   =>  arimo 1   =>  quicksand 2   =>  cantarell 3   =>  muli 4   =>  roboto+slab 5   =>  share 6   =>  inconsolata 7   =>  karla 8   =>  maven+pro 9   =>  roboto+slab 10  =>  open+sans ) 

there's + sign font name has spaces. want rid of that.

i'm not regex expert. so, couldn't manage that.

note: know str_replace() don't want go through long process. want know if it's possible escape + sign through , leave empty space there when collecting matched expressions.

spaces encoded plus (+) signs in url. should decode url.

$input = urldecode($input);