How to preg_match an array?

[s3nzo]

Let's say i have an array

$smileys = array(':)', ':(', ':D') 

and i want to match part of that array how can i use preg_match to achieve this?
Here's what i tried but it didn't work

if($preg = preg_match('/[[:alnum:]]/i', $smileys, $matches))
print_r($matches); 

The error i get is

Warning: preg_match() expects parameter 2 to be string, array given

[anabolik]

$matches = array_map(function($string) { preg_match('/[[:alnum:]]/i', $string, $matches); return $matches; }, $smileys); 

[standalone]

anabolik is a popular programmer

[subzero]

foreach("$smileys" as $smiles);

lol and list will go on