I have a string which may be an URL. I want to determine if its a Http/FTP URL by a regex. If the string is valid URL then I will make it hyperlink and a blue color etc, if its not an URL based on ture or false of regex exp i want to decide further..
Whats is best Regex for it ?
isUrlValid(str)
{
var pattern = new RegExp('^(https?:\\/\\/)?((([a-z\\d]([a-z\\d-]*[a-z\\d])*)\\.)+[a-z]{2,}|((\\d{1,3}\\.){3}\\d{1,3}))(\\:\\d+)?(\\/[-a-z\\d%_.~+]*)*(\\?[;&a-z\\d%_.~+=-]*)?(\\#[-a-z\\d_]*)?$', 'g');
return pattern.test(str);
}
This perl code is pretty accurate, probably not perfect. Group 1 contains either http or ftp
if ($str =~ /^(http|ftp):\/\/[\w.%@]+(:?[?].*)?/) {
print "matches $1\n";
} else {
print "no match\n";
}
Just in case you want to know if the url really exists:
function url_exist($url){//se passar a URL existe
$c=curl_init();
curl_setopt($c,CURLOPT_URL,$url);
curl_setopt($c,CURLOPT_HEADER,1);//get the header
curl_setopt($c,CURLOPT_NOBODY,1);//and *only* get the header
curl_setopt($c,CURLOPT_RETURNTRANSFER,1);//get the response as a string from curl_exec(), rather than echoing it
curl_setopt($c,CURLOPT_FRESH_CONNECT,1);//don't use a cached version of the url
if(!curl_exec($c)){
//echo $url.' inexists';
return false;
}else{
//echo $url.' exists';
return true;
}
//$httpcode=curl_getinfo($c,CURLINFO_HTTP_CODE);
//return ($httpcode<400);
}
