Cytat
preg_match() returns the number of times pattern matches. That will be either 0 times (no match) or 1 time because preg_match() will stop searching after the first match. preg_match_all() on the contrary will continue until it reaches the end of subject. preg_match() returns FALSE if an error occurred.
<?php
if (preg_match('/([0-9]+).([0-9]{2})/', $zmienna) == true) ?>
(za duzo od jedno '=')