is there a way of finding if a html page has a certain format?

I want to do one thing if the html page contains

<span class="tel">Tel: 021 4929850 </span>

and another thing if the html page contains

<span class="tel">Tel: 021 4929850 </span>


<span class="tel2">Tel: 087 9870805</span>

Im using the file_get_contents(); funtion to get the html code..

Here's a start

preg_match_all('/<span class="(.*)">Tel: 087 9870805<\/span>/Uis', $html, $matches,PREG_SET_ORDER);
print_r($matches);

your matches are stored in $matches , just loop in $matches to find "tel2" and do your stuff, etc...