make regex

function makeRegex($text)
{
    $text=preg_replace('#{([a-z]+)-d}#',"(?P<\${1}>[0-9]+)",$text);
    $text=preg_replace('#{([a-z]+)-t}#',"(?P<\${1}>[a-zA-Z0-9]+)",$text);
    $regex="~".$text.'~';
    return $regex;
}