Javascript regular expression to validate URL

Question

I am validating URL with following regular expression. I want to validate google.com also but it returns false. What can be changed in R.E below to validate google.com.

console.log(learnRegExp('http://www.google-com.123')); // false console.log(learnRegExp('https://www.google-com.com')); // true console.log(learnRegExp('http://google-com.com')); // true console.log(learnRegExp('http://google.com')); //true console.log(learnRegExp('google.com')); //false  function learnRegExp(){   return /^(ftp|https?):\/\/+(www\.)?[a-z0-9\-\.]{3,}\.[a-z]{3}$/.test(learnRegExp.arguments[0]); } 

Answer 1

This validate the URL in general

console.log('http://www.google-com.123.com', validateUrl('http://www.google-com.123.com')); // true   console.log('http://www.google-com.123', validateUrl('http://www.google-com.123')); // false   console.log('https://www.google-com.com', validateUrl('https://www.google-com.com')); // true   console.log('http://google-com.com', validateUrl('http://google-com.com')); // true   console.log('http://google.com', validateUrl('http://google.com')); //true   console.log('google.com', validateUrl('google.com')); //false  console.log('http://www.gfh.', validateUrl('http://www.gfh.')); //false  console.log('http://www.gfh.c', validateUrl('http://www.gfh.c')); //false  console.log('http://www.gfh:800000', validateUrl('http://www.gfh:800000')); //false  console.log('www.google.com ', validateUrl('www.google.com ')); //false  console.log('http://google', validateUrl('http://google')); //false  console.log('//cdnblabla.cloudfront.net/css/app.css', validateUrl('//cdnblabla.cloudfront.net/css/app.css')); //true    function validateUrl(value) {    return /^(?:(?:(?:https?|ftp):)?\/\/)(?:\S+(?::\S*)?@)?(?:(?!(?: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})(?:[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]))|(?:(?:[a-z\u00a1-\uffff0-9]-*)*[a-z\u00a1-\uffff0-9]+)(?:\.(?:[a-z\u00a1-\uffff0-9]-*)*[a-z\u00a1-\uffff0-9]+)*(?:\.(?:[a-z\u00a1-\uffff]{2,})))(?::\d{2,5})?(?:[/?#]\S*)?$/i.test(value);  }

Should Match

["//www.google.com", "//cdnblabla.cloudfront.net/css/app.css", "http://✪df.ws/123", "http://userid:[email protected]:8080", "http://userid:[email protected]:8080/", "http://[email protected]", "http://[email protected]/", "http://[email protected]:8080", "http://[email protected]:8080/", "http://userid:[email protected]", "http://userid:[email protected]/", "http://142.42.1.1/", "http://142.42.1.1:8080/", "http://➡.ws/䨹", "http://⌘.ws", "http://⌘.ws/", "http://foo.com/blah_(wikipedia)#cite-1", "http://foo.com/blah_(wikipedia)_blah#cite-1", "http://foo.com/unicode_(✪)_in_parens", "http://foo.com/(something)?after=parens", "http://☺.damowmow.com/", "http://code.google.com/events/#&product=browser", "http://j.mp", "ftp://foo.bar/baz", "http://foo.bar/?q=Test%20URL-encoded%20stuff", "http://مثال.إختبار", "http://例子.测试"].map(function(url) {    console.log(url, validateUrl(url));  });    function validateUrl(value) {    return /^(?:(?:(?:https?|ftp):)?\/\/)(?:\S+(?::\S*)?@)?(?:(?!(?: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})(?:[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]))|(?:(?:[a-z\u00a1-\uffff0-9]-*)*[a-z\u00a1-\uffff0-9]+)(?:\.(?:[a-z\u00a1-\uffff0-9]-*)*[a-z\u00a1-\uffff0-9]+)*(?:\.(?:[a-z\u00a1-\uffff]{2,})))(?::\d{2,5})?(?:[/?#]\S*)?$/i.test(value);  }

Should Fail

["http://", "http://.", "http://..", "http://../", "http://?", "http://??", "http://??/", "http://#", "http://##", "http://##/", "http://foo.bar?q=Spaces should be encoded", "//", "//a", "///a", "///", "http:///a", "foo.com", "rdar://1234", "h://test", "http:// shouldfail.com", ":// should fail", "http://foo.bar/foo(bar)baz quux", "ftps://foo.bar/", "http://-error-.invalid/", "http://-a.b.co", "http://a.b-.co", "http://0.0.0.0", "http://10.1.1.0", "http://10.1.1.255", "http://224.1.1.1", "http://1.1.1.1.1", "http://123.123.123", "http://3628126748", "http://.www.foo.bar/", "http://www.foo.bar./", "http://.www.foo.bar./", "http://10.1.1.1", "http://10.1.1.254"].map(function(url) {    console.log(url, validateUrl(url));  });    function validateUrl(value) {    return /^(?:(?:(?:https?|ftp):)?\/\/)(?:\S+(?::\S*)?@)?(?:(?!(?: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})(?:[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]))|(?:(?:[a-z\u00a1-\uffff0-9]-*)*[a-z\u00a1-\uffff0-9]+)(?:\.(?:[a-z\u00a1-\uffff0-9]-*)*[a-z\u00a1-\uffff0-9]+)*(?:\.(?:[a-z\u00a1-\uffff]{2,})))(?::\d{2,5})?(?:[/?#]\S*)?$/i.test(value);  }

How it works

// 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,})))" // port number "(?::\\d{2,5})?" // resource path "(?:[/?#]\\S*)?" 

All this comes from this gist, i hope that this fill all your needs