PHP urlize - transformer des chaînes https, mailto etc.

function urlise($chaine) { //a function to extract urls from pages
#echo "test urlize: <br>" .$chaine ."<hr>";
#$chaine=ereg_replace("(http://)(([[:punct:]]|[[:alnum:]]=?)*)","<a href=\"\\0\">\\0</a>",$chaine);
$chaine = preg_replace("/(https:\/\/)(([[:punct:]]|[[:alnum:]]=?)*)/","<a href=\"\\0\">\\0</a>",$chaine);
$chaine=preg_replace("/(http:\/\/)(([[:punct:]]|[[:alnum:]]=?)*)/","<a href=\"\\0\">\\0</a>",$chaine);
//now replace emails
if(!preg_match("/[a-zA-Z0-9]*\.[a-zA-Z0-9]*@/",$chaine)){
#$chaine = ereg_replace('[-a-zA-Z0-9!#$%&\'*+/=?^_`{|}~]+@([.]?[a-zA-Z0-9_/-])*','<a href="mailto:\\0">\\0</a>',$chaine);
#$chaine = preg_replace('/[-a-zA-Z0-9!#$%&\'*+/=?^_`{|}~]+@([.]?[a-zA-Z0-9_\/-])*/','<a href="mailto:\\0">\\0</a>',$chaine);
}else {
$chaine = preg_replace('/[-a-zA-Z0-9]*\.[-a-zA-Z0-9!#$%&\'*+\/=?^_`{|}~]+@([.]?[a-zA-Z0-9_\/-])*/','<a href="mailto:\\0">\\0</a>',$chaine);	
}
 
echo nl2br($chaine);
}