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@michaelkantor
Created August 26, 2016 21:46
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// Derived from https://gist.github.com/dperini/729294
function isURL(extensions) {
var resource = '?';
if (extensions) resource = '\.(' + extensions.join('|') + ')';
return new RegExp(
// 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\\u00a1-\\uffff0-9]-*)*[a-z\\u00a1-\\uffff0-9]+)' +
// domain name
'(?:\\.(?:[a-z\\u00a1-\\uffff0-9]-*)*[a-z\\u00a1-\\uffff0-9]+)*' +
// TLD identifier
'(?:\\.(?:[a-z\\u00a1-\\uffff]{2,}))' +
// TLD may end with dot
'\\.?' +
')' +
// port number
'(?::\\d{2,5})?' +
// resource path
'(?:[/?#]\\S*)' + resource, 'igm'
);
}
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