Problème de REGEX avec accents

(l')?([a-zA-Z]*)

$q=mysql_query("SELECT products_description FROM description where products_id = 1);
$r=mysql_fetch_array($q);
$texte=$r['products_description'];

if(false !== preg_match_all("/[a-z-&;]{5,80}/i", $texte, $matches)) {
	if(is_array($matches[0]) && sizeof($matches[0])>0) {
		$matches = array_unique($matches[0]);
	}
	
	foreach($matches as $a => $match) {
		$resultats .= $match. ', ';
	}
}

tapir => tapir
l'arbre => arbre

(((l|d|qu)(&ap...;|'))?)([a-zA-Z&;]*)

"/(((l'|d'|qu'|jusqu')('))?)([a-zA-Z&;]{5,50})/"