CODEWITHSUNDEEP
javascriptregexdnspattern-matching
sstauross
sstauross

Reputation: 2680

get host name from domain REGEX javascript

What i try to do is when i have:

www.gmail.com,

www.gmail.com/,

http://www.gmail.com,

https://www.gmail.com,

http://gmail.com,

https://gmail.com,

www.gmail.com/example

just get gmail.com, by far from searching into relative questions i have pattern to match these things which is:

var pat = /^(https?:\/\/)?(?:www\.)?([^\/]+)/;

but it also returns true when i put also a word eg. gmail (without .com). How can i improve this to match things that are of the form abcd.efgs.com ? I mean specify that the string should contain characters and at least one dot after the http,https,www. ?

Thanks in advance!

Upvotes: 1

Views: 6198

Answers (3)

kums
kums

Reputation: 2691

If my understanding is right, you want to match only the domain names of a URL.

You can do this with this pattern

(?:\w+\.)+\w+

I have copied your JavaScript Fiddle and made changes to demonstrate this using html text and textarea boxes. The textbox demo, extracts the domain name from a user entered URL. The textarea box demo lists all the domains in the entered multiline text.

http://jsfiddle.net/q6z3xb6d/

[update]

Just read your question again. Looks like you want to exclude matches for domains beginning with www. You can use this pattern for that:

(?!(w+)\.)\w*(?:\w+\.)+\w+

JS fiddle demo - Updated version:

http://jsfiddle.net/q6z3xb6d/2/

Upvotes: 5

sstauross
sstauross

Reputation: 2680

Given an input field like: 

<input type='text' id='domain'/>

i ended up with this solution in which i first validate it as a url and then get the string without 'http://', 'https://' , 'www.'

$(document).ready(function(){

function ValidUrl(str) {
  var pattern = new RegExp('^(https?:\\/\\/)?'+ // protocol
  '((([a-z\\d]([a-z\\d-]*[a-z\\d])*)\\.)+[a-z]{2,}|'+ // domain name
  '((\\d{1,3}\\.){3}\\d{1,3}))'+ // OR ip (v4) address
  '(\\:\\d+)?(\\/[-a-z\\d%_.~+]*)*'+ // port and path
  '(\\?[;&a-z\\d%_.~+=-]*)?'+ // query string
  '(\\#[-a-z\\d_]*)?$','i'); // fragment locator
  if(!pattern.test(str)) {
    return false;
  } else {
    return true;
  }
}

$('#domain').change(function(){
    var str = $.trim($(this).val());
    if(ValidUrl(str)){
       var pat = /^(https?:\/\/)?(?:www\.)?([^\/]+)/;
       var match = str.match(pat);
        console.log(match);
         //$(this).val(str);
    }
    else{
        $(this).val('Validation failed');
    }
});
});

See also this jsfiddle:http://jsfiddle.net/6mrbbq9x/5/

Upvotes: 0

vks
vks

Reputation: 67968

^(?:https?:\/\/)?(?:www\.)?((?:(?!www\.|\.).)+\.[a-zA-Z0-9.]+)

Try this.See demo.

http://regex101.com/r/yG7zB9/7

Upvotes: 0

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