- print_r: documentation ( source)
- preg_match_all: documentation ( source)
<?php
$t = "Pompe à eau Bmw 316-->325/Touring (E30) 1.8 318i / Auto. (M40) 1796cc 10/87->93";
preg_match_all('/[0-9]{1,2}\/[0-9]{2,4}[\s]*->([0-9]{1,2}\/[0-9]{2,4}){0,1}/', $t, $periode);
print_r($periode);