Validate url using regexp in javascript

Question

I have a string to validate if it is a valid url or not. I have googled it, I could only found the solution if url contains http or https

I want to make the url as valid even if it does not contain http infront of its domain name example -> www.google.com

These are some of the urls I have tried and they did work.

http://blog.mattheworiordan.com/post/13174566389/url-regular-expression-for-links-with-or-without-the
http://stackoverflow.com/questions/37684/how-to-replace-plain-urls-with-links
http://stackoverflow.com/questions/5717093/check-if-a-javascript-string-is-an-url

But they validate it as true even when I give h/www.stackoverflow.com which is not a valid url also /www.stackoverflow.com validates to true

They are not the valid urls. Can anyone help me writing the regular expression. I wanted to write this regular exp on my own but I am unable to find good tutorials on regexp. I could barely write expressions such as containing a character, a litle small ones.

I believe its the area Iam little weak I want to practise some regular expressions. Any help is greatly appreciated.

Kindly help me in validating this url.

Update

 ((([A-Za-z]{3,9}:(?:\/\/)?)(?:[\-;:&=\+\$,\w]+@)?[A-Za-z0-9\.\-]+|(?:www\.|[\-;:&=\+\$,\w]+@)[A-Za-z0-9\.\-]+)((?:\/[\+~%\/\.\w\-_]*)?\??(?:[\-\+=&;%@\.\w_]*)#?(?:[\.\!\/\\\w]*))?)

This is the regexp Iam currently using

I kindly request you to make a js fiddle and that makes h/www.stackoverflow.com to false. Sorry but none of the answers did not work.

Please post your regex which you got now.

xate
– xate

2014-06-09 12:51:25 +00:00
Commented Jun 9, 2014 at 12:51 — xate
– xate, Commented Jun 9, 2014 at 12:51
So make the first part optional...

epascarello
– epascarello

2014-06-09 12:53:13 +00:00
Commented Jun 9, 2014 at 12:53 — epascarello
– epascarello, Commented Jun 9, 2014 at 12:53
@Xatenev just updated it.

user3205479
– user3205479

2014-06-09 12:53:21 +00:00
Commented Jun 9, 2014 at 12:53 — user3205479
– user3205479, Commented Jun 9, 2014 at 12:53

Adrian B · Accepted Answer · 2014-06-09 13:11:31Z

0

You can use this (works on urls that starts with www.)

function ValidURL(str) {
  var pattern = new RegExp('(?:https?:\/\/|www\.)+[a-z0-9\-\.]+\.[a-z]{2,5}(?:(?:\/|#|\?)[^\s]*)?','i');
  if(!pattern.test(str)) {
    return false;
  } else {
    return true;
  }
}

edited Jun 9, 2014 at 13:11

answered Jun 9, 2014 at 12:54

Adrian B

1,6601 gold badge20 silver badges31 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

user3205479 Over a year ago

Uncaught SyntaxError: Invalid regular expression: /(?:https?://|www.)+[a-z0-9-.]+.[a-z]{2,5}(?:(?:/|#|?)[^s]*)?/: Nothing to repeat

hjpotter92 · Accepted Answer · 2014-06-09 13:31:49Z

0

You can use an alternate method for matching URLs if they are strings.

var x;
try {
    var t = new URL( yourStringHere );
    x = true;
}
catch( e ) {
    x = false;
}

answered Jun 9, 2014 at 13:31

hjpotter92

81.1k36 gold badges148 silver badges188 bronze badges

Collectives™ on Stack Overflow

Validate url using regexp in javascript

2 Answers 2

1 Comment

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related