PHP Function to Validate URLs

Usage of simple URL validation function in php. This simple function helps in validation of URL for correct format, this also validates for mailto links in the content.

function validateURL($url) {
    return (bool)preg_match("^((((https?|ftps?|gopher|telnet|nntp)://)|(mailto:|news:))(%[0-9A-Fa-f]{2}|[-()_.!~*';/?:@&=+$,A-Za-z0-9])+)([).!';/?:,][[:blank:]])?$",$url);
}