>> javscript validation for url

Hi Guys,

I have a form where I'm collection a url.  An example of correct input in this field would be 'google.com' or 'anyotherdomain1234.com'

So basically I guess I just need a regex or regular javascript code to make sure that it has a '.[TLD]' at the end.

Thanks!!!  : )

Johnny

webgeek154Asked:
Who is Participating?
 
ahoffmannConnect With a Mentor Commented:
if (field.value.match(/\.(?biz|com|de|es|fr|ga|hu|info|jp|za)$/i)) {
   // it does match; but ther're much more TLDs
}
0
 
Ronb23Commented:
you can try something like this:

function vTLD(){
var knownTLDs=".com .net .org .edu .gov .biz .info";

var myURL = document.myform.url.value;
var endofString = myURL.split('.');
var ending = endofString.length - 1;
var tld = endofString[ending];
   if (knownTLDs.search(tld) < 0){
      alert('Invalid URL');
      return false;
   } else {
      return true;
   }
}
0
 
b0lsc0ttIT ManagerCommented:
webgeek154,

It can be hard to make a regular expression that will test for domain name, even just the TLD part.  Do you need to support domains besides .com?  Any international domains?  The more domains you need to allow the longer the regex and generally the less specific it is (i.e. it doesn't look for .com, etc but just the right number of characters in the TLD).  The regex in Javascript's match for the domains you mentioned would be ...

if (field.value.match(/\.com$/i)) {
   // it does match
}

To add a few more TLDs, like those listed by Ronb23 would not be hard.  I do have some regex that will check domain names according to specs but even those aren't fool proof and may be overkill if you know the domains entered will only be certain types.

Let me know if you have any questions or need more information.

b0lsc0tt
0
Cloud Class® Course: Microsoft Azure 2017

Azure has a changed a lot since it was originally introduce by adding new services and features. Do you know everything you need to about Azure? This course will teach you about the Azure App Service, monitoring and application insights, DevOps, and Team Services.

 
b0lsc0ttConnect With a Mentor IT ManagerCommented:
ahoffmann,
It is a Monday and I have been using Regexes a little less recently so maybe I am wrong but I think you have a small typo.  Doesn't the ? character in your regex need the colon after it.  I believe you are trying to make that group a non-capturing group.  Just wanted to post this in case I am right so there wouldn't be a problem with the Asker using your code.
if (field.value.match(/\.(?:biz|com|de|es|fr|ga|hu|info|jp|za)$/i)) {
bol
0
 
ahoffmannCommented:
good catch b0lsc0tt.
0
 
b0lsc0ttIT ManagerCommented:
ahoffmann,
Your welcome!  Glad to help and that my regex skills aren't gone completely. :D
webgeek154,
If you use Ahoffmann's code then please no credit to me for the change.   It was very minor and would've been caught by Ahoffmann had you posted about a problem.  If you are around it would be great to get some comment and feedback though.  You have plenty to work with now.
bol
0
 
b0lsc0ttIT ManagerCommented:
webgeek154,
Thanks for closing this.  It seems from your comment you acknowledge we (ahoffmann and I) both helped.  You probably meant to split the points and accept both comments.  That didn't happen though.
I am going to use Request Attention to have a moderator reopen this and correct how it was closed.  Please post if you disagree with my efforts and explain why.  Thanks for the fun question and credit.  I am glad I could help a bit.
bol
0
 
webgeek154Author Commented:
thanks guys!!!
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

All Courses

From novice to tech pro — start learning today.