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]);
}

are you trying to validate all url's or else you need only for 'google.com'? — Unknown, Dec 29 '11 at 11:14
Wrapping `(ftp|https?):\/\/+(www\.)?` with `( ... )?` will do. However, does this regex really suit your needs? I mean: `\.[a-z]{3}$` alone does exclude *many* valid URLs. — jensgram, Dec 29 '11 at 11:18
possible duplicate of [What is the best regular expression to check if a string is a valid URL?](http://stackoverflow.com/questions/161738/what-is-the-best-regular-expression-to-check-if-a-string-is-a-valid-url) — user123444555621, Dec 29 '11 at 12:07

Christian David · Answer 1 · 2017-02-20T19:23:41.363

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:password@example.com:8080", "http://userid:password@example.com:8080/", "http://userid@example.com", "http://userid@example.com/", "http://userid@example.com:8080", "http://userid@example.com:8080/", "http://userid:password@example.com", "http://userid:password@example.com/", "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

I applaud you for or the longest and most incomprehensible regex I've ever seen. — jpschroeder, Aug 31 '16 at 15:25
Also this fits the OP needs, it does not validate URL in general. — Lain, Dec 06 '16 at 14:09
Thanks for your comments, i already updated the code to fix your worries — Christian David, Feb 20 '17 at 19:25
@V.J. then, convert url to lowerCase before validating. you could use `.toLowerCase()` in javascript on a string value — akolliy, May 22 '20 at 19:20
like this is not valid input pattern. My input field won't validate after I have written correct URL. — akolliy, May 22 '20 at 20:00
sorry! man, it's working now, I just needed to remove the two (open and close) slash `/`. — akolliy, May 22 '20 at 20:32

score 6 · Answer 2 · answered Jan 12 '14 at 16:35

6

This is perfect for me. I hope it will be perfect for someone else! :)

/^((https?):\/\/)?([w|W]{3}\.)+[a-zA-Z0-9\-\.]{3,}\.[a-zA-Z]{2,}(\.[a-zA-Z]{2,})?$/

answered Jan 12 '14 at 16:35

Rorshack

77
1
1

What does this answer provide that the earlier answers don't already provide? – Louis Jan 12 '14 at 16:51
@Louis which previous answers? – Mike Szyndel Jan 12 '14 at 16:53
this is much better than the most voted answer which doesn't work cause accepts anything like ww.google or www.google or www.google.c ....but yours works perfectly....nice job – Juan Sep 13 '16 at 06:34
This also only accepts URLs in the www subdomain. URls such as https://developers.facebook.com/ will not pass this check. Replacing + with * fixes that though. – Steve Aug 08 '17 at 12:11

score 2 · Answer 3 · answered Dec 29 '11 at 11:13

2

/(http|https):\/\/(\w+:{0,1}\w*@)?(\S+)(:[0-9]+)?(\/|\/([\w#!:.?+=&%@!\-\/]))?/

answered Dec 29 '11 at 11:13

Acn

872
2
9
22

Looks like google.com is not validating.Added some code to validate. :-) – Unknown Dec 29 '11 at 11:19

score 2 · Answer 4 · answered Dec 29 '11 at 11:22

2

Here you go, you need to make "ftp/http(s)://" not a MUST. Use "?" for this.

function learnRegExp(){
  return /((ftp|https?):\/\/)?(www\.)?[a-z0-9\-\.]{3,}\.[a-z]{3}$/.test(learnRegExp.arguments[0]);
}

answered Dec 29 '11 at 11:22

ArVan

3,925
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As you can see, I only wrapped your `(ftp|https?):\/\/` into `()?`. – ArVan Dec 29 '11 at 11:25
How do I make it not to match a http / https? – San Aug 08 '13 at 06:18
1

@San Replace `(ftp|https?)` with `ftp` – ewen-lbh May 18 '20 at 17:32

score 0 · Answer 5 · answered Aug 22 '18 at 03:34

Why not have multiple regex for each case?

Valid alphanumeric url: /^https?:\/\/([\w\d\-]+\.)+\w{2,}(\/.+)?$/

Works with http://sub_do-main.a.co to things like https://a.a.a.a.aa/my-awesome_url?asd=12. You can try it at: https://regex101.com/r/oXFuGy/2
IPv4, short and fast but not 100% accurate (it is used by validator.js): /^(\d{1,3}(\.|$)){4}/. It allows things like 999.999.999.999.
IPv4, larger, slower but 100% accurate: ^(((25[0-5])|(2[0-4]\d)|(1\d{2})|(\d{1,2}))\.){3}(((25[0-5])|(2[0-4]\d)|(1\d{2})|(\d{1,2})))$. Found it here: https://stackoverflow.com/a/50650510/2862917.
IPv6 (I don't know exactly if this is the best/accurate/faster approach: ^(([\da-fA-F]{0,4}:){1,7}[\da-fA-F]{0,4})$. Found it here: Regular expression that matches valid IPv6 addresses which has as a first answer why would be better to stop using regex to try to validate IP's (at least those v6).

T I · Answer 6 · 2011-12-29T11:23:01.420

0

^... symbol is saying begins with so the final log makes sense, i.e. the string does not begin with ftp or http(s). Youre also saying with ...$ that the end that the string must finish with three letters which again where it fails (line 2) it does not end like this. Some minor adjustments and you should be there.

edited Dec 29 '11 at 11:23

answered Dec 29 '11 at 11:17

T I

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Javascript regular expression to validate URL

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