URL Regex

const QString urlRegExp = "^"
// protocol identifier
"(?:(?:https?|ftp)://)"
// user:pass authentication
"(?:\\S+(?::\\S*)?@)?"
"(?:"
// IP address exclusion
// private & local networks
"(?!(?:10|127)(?:\\.\\d{1,3}){3})"
"(?!(?:169\\.254|192\\.168)(?:\\.\\d{1,3}){2})"
"(?!172\\.(?:1[6-9]|2\\d|3[0-1])(?:\\.\\d{1,3}){2})"
// IP address dotted notation octets
// excludes loopback network 0.0.0.0
// excludes reserved space >= 224.0.0.0
// excludes network & broacast addresses
// (first & last IP address of each class)
"(?:[1-9]\\d?|1\\d\\d|2[01]\\d|22[0-3])"
"(?:\\.(?:1?\\d{1,2}|2[0-4]\\d|25[0-5])){2}"
"(?:\\.(?:[1-9]\\d?|1\\d\\d|2[0-4]\\d|25[0-4]))"
"|"
// host name
"(?:(?:[_a-z\\x{00a1}-\\x{ffff}0-9]-*)*[a-z\\x{00a1}-\\x{ffff0}-9]+)"
// domain name
"(?:\\.(?:[a-z\\x{00a1}-\\x{ffff0}-9]-*)*[a-z\\x{00a1}-\\x{ffff0}-9]+)*"
// TLD identifier
"(?:\\.(?:[a-z\\x{00a1}-\\x{ffff}]{2,}))"
"\\.?"
")"
// port number
"(?::\\d{2,5})?"
// resource path
"(?:[/?#]\\S*)?"
"$";

static QRegularExpression linkRegex(urlRegExp, QRegularExpression::CaseInsensitiveOption);