Preg_match issues

[kickassamd]

I cannot figure out how to get preg_match to match

 

= <= >= !=

 

I had a simple function that looked for each but the problem with that is it found = when it was really <= so is there a way with regex to match ONLY the character supplied?

[sasa]

<?php
$a = '2 = 3 and 5 != 5';
preg_match_all('/(<=)|(>=)|(!=)|(=)/', $a, $b);
print_r($b[0]);
?>