- strpos: documentation ( source)
<?php
$string='Case Color: Blue<br/> Ink Color: Blue<br/> Commission Name: renew<br/> County of Commission: renew<br/> Expiration Date: renew';
$pos=0;
$count=0;
while(($pos = strpos($string, 'Case Color: Blue',$pos)) !== FALSE){
$count++;
$pos++;
// This ends
}
echo $count;