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Redirect to different URL when current URL contains some string

I have a requirement wherein I need to redirect my page to a different URL when my current URL contains some string.
For instance,
If my current URL contains www.testdomain.com or www.testdomain.com/web/region then it should redirect to www.testdomain.com/group/region. I tried the below code but it returns "The requested resource could not be found -- https://www.testdomain.com/web/region/testdomain.com/group/region".
$(document).ready(function() {
if (window.location.href.indexOf("web/region") > -1) {
window.location.href=window.location.hostname+'/group/region';
}
})
It is adding the URL twice here. But when I pass the direct URL window. location.href="www.testdomain.com/group/region" it is working.
Can someone guide me on how do I force redirect my page if the URL contains www.testdomain.com or www.testdomain.com/web/region?
Thanks

Start with // so that the browser knows it's not a relative URI:
window.location.href = '//' + window.location.hostname+'/group/region';
You can also prepend the protocol:
window.location.href = window.location.protocol + '//' + window.location.hostname+'/group/region';

It's adding the URL twice because browsers interpret /group/region as a relative path, automatically prepending the current domain UNLESS otherwise specified. (Maybe others can explain why window.location.hostname doesn't immediately return, thus preventing the browser from assuming a relative path?)
Example: If you explicitly set a domain, the browser will redirect to it as expected.
window.location.href='http://www.google.com/'
Otherwise, if you take away "www."
window.location.href='google.com/'
Your browser will redirect to "www.testdomain.com/google.com", appending the string.
The fix is simple.
Just delete window.location.hostname+ and it will only return the URL once.
Or... for a better user experience, I would suggest using window.location.replace() which DOES NOT save the current page in session history.(You don't want to go back, just to be redirected again!)
SOLUTION:
Replace your return block with this.
window.location.replace('/group/region')

Extract parameter from url path in javascript

I want to extract a part of an url path but i don't know how to do that.
I want to get a value (3252) from a path like this:
/forums/0-3252-1-1-my-topic-title.htm
How can i do that ?
Thank you

If you want to work with URL there is a powerful tool on which you can reply and that is JavaScript Window Location.
The window.location object can be used to get the current page address (URL).
The window.location object have many properties or method.
Some examples:
window.location.href returns the href (URL) of the current page
window.location.hostname returns the domain name of the web host
window.location.pathname returns the path and filename of the current page
window.location.protocol returns the web protocol used (http: or https:)
window.location.assign() loads a new document
Example:
Display the href (URL) of the current page:
<script>
alert(window.location.href);
</script>
Follow link to read more: Window Location

Why is window.location.href appending url again

In my code, I'm assigning the following:
window.location.href = "www.example.com/test";
But when the page actually loads, the browser URL is www.example.com/test/www.example.com/test. I'm not appending anything to the URL, and I'm not sure how its appending the URL again.

I think you're missing the "http" or "https" part. Have you tried the following?
window.location.href = "https://www.example.com/test";
or
window.location.href = "http://www.example.com/test";

Because you forgot the protocol. If you omit the protocol, window.location.href thinks you are trying to access a folder with the name of www.example.com, relative to the page you are currently on.
window.location.href="http://www.example.com/test/" will ensure that you access the external website www.example.com.
Hope this helps! :)

Check the way you are constructing the url, sometimes we miss the host, or enter the incorrect path
A safe way to change the URl is by making changes in the exisiting URL
first get the existing URL by
let exisitingURl = window.location.href;
now manipulate this url, for eg
exisitingURL = exisitingURL.replace('/auth', '/gateway');
now go to the url by
window.location.href = existingURL;

What can I do to ignore the domain on a redirect request?

I have 3 domains, one is for development, another for QA and another for production.
Let's say:
dev-domain.com
qa-domain.com
prod-domain.com
And I want to send the user to another location after he submits an email:
window.location.href = 'confirmation.html';
So, what I want to avoid doing on every environment:
window.location.href = 'dev-domain.com/confirmation.html'; or window.location.href = 'qa-domain.com/confirmation.html';, and only doing something like:
window.location.href = '(Test-Domain)/confirmation.html';
Any suggestions?

file_name.html should be sufficient because it's relative path. Do you need to implement absolute paths?

window.location has several properties, like host, protocol, port, etc - https://developer.mozilla.org/en-US/docs/Web/API/Location
You can change just the path of the Location object:
window.location.pathname = '/confirmation.html';

Yes, as Oluwafemi Sule pointed out the window.location.hostname property returns the name of the internet host (of the current page).
So you can use:
window.location.href = window.location.hostname + '/confirmation.html';

Get The Current Domain Name With Javascript (Not the path, etc.)

I plan on buying two domain names for the same site. Depending on which domain is used I plan on providing slightly different data on the page. Is there a way for me to detect the actual domain name that the page is loading from so that I know what to change my content to?
I've looked around for stuff like this but most of it doesn't work the way I want it to.
For instance when using
document.write(document.location)
on JSFiddle it returns
http://fiddle.jshell.net/_display/
i.e. the actual path or whatever that is.

How about:
window.location.hostname
The location object actually has a number of attributes referring to different parts of the URL

Let's suppose you have this url path:
http://localhost:4200/landing?query=1#2
So, you can serve yourself by the location values, as follow:
window.location.hash: "#2"
​
window.location.host: "localhost:4200"
​
window.location.hostname: "localhost"
​
window.location.href: "http://localhost:4200/landing?query=1#2"
​
window.location.origin: "http://localhost:4200"
​
window.location.pathname: "/landing"
​
window.location.port: "4200"
​
window.location.protocol: "http:"
window.location.search: "?query=1"
Now we can conclude you're looking for:
window.location.hostname

If you are not interested in the host name (for example www.beta.example.com) but in the domain name (for example example.com), this works for valid host names:
function getDomainName(hostName)
{
return hostName.substring(hostName.lastIndexOf(".", hostName.lastIndexOf(".") - 1) + 1);
}

function getDomain(url, subdomain) {
subdomain = subdomain || false;
url = url.replace(/(https?:\/\/)?(www.)?/i, '');
if (!subdomain) {
url = url.split('.');
url = url.slice(url.length - 2).join('.');
}
if (url.indexOf('/') !== -1) {
return url.split('/')[0];
}
return url;
}
Examples
getDomain('http://www.example.com'); // example.com
getDomain('www.example.com'); // example.com
getDomain('http://blog.example.com', true); // blog.example.com
getDomain(location.href); // ..
Previous version was getting full domain (including subdomain). Now it determines the right domain depending on preference. So that when a 2nd argument is provided as true it will include the subdomain, otherwise it returns only the 'main domain'

If you wish a full domain origin, you can use this:
document.location.origin
And if you wish to get only the domain, use can you just this:
document.location.hostname
But you have other options, take a look at the properties in:
document.location

You can get it from location object in Javascript easily:
For example URL of this page is:
http://www.stackoverflow.com/questions/11401897/get-the-current-domain-name-with-javascript-not-the-path-etc
Then we can get the exact domain with following properties of location object:
location.host = "www.stackoverflow.com"
location.protocol= "http:"
you can make the full domain with:
location.protocol + "//" + location.host
Which in this example returns http://www.stackoverflow.com
I addition of this we can get full URL and also the path with other properties of location object:
location.href= "http://www.stackoverflow.com/questions/11401897/get-the-current-domain-name-with-javascript-not-the-path-etc"
location.pathname= "questions/11401897/get-the-current-domain-name-with-javascript-not-the-path-etc"

window.location.hostname is a good start. But it includes sub-domains, which you probably want to remove. E.g. if the hostname is www.example.com, you probably want just the example.com bit.
There are, as ever, corner cases that make this fiddly, e.g. bbc.co.uk. The following regex works well for me:
let hostname = window.location.hostname;
// remove any subdomains, e.g. www.example.com -> example.com
let domain = hostname.match(/^(?:.*?\.)?([a-zA-Z0-9\-_]{3,}\.(?:\w{2,8}|\w{2,4}\.\w{2,4}))$/)[1];
console.log("domain: ", domain);

Since this question asks for domain name, not host name, a correct answer should be
window.location.hostname.split('.').slice(-2).join('.')
This works for host names like www.example.com too.

If you are only interested in the domain name and want to ignore the subdomain then you need to parse it out of host and hostname.
The following code does this:
var firstDot = window.location.hostname.indexOf('.');
var tld = ".net";
var isSubdomain = firstDot < window.location.hostname.indexOf(tld);
var domain;
if (isSubdomain) {
domain = window.location.hostname.substring(firstDot == -1 ? 0 : firstDot + 1);
}
else {
domain = window.location.hostname;
}
http://jsfiddle.net/5U366/4/

Use
document.write(document.location.hostname)​
window.location has a bunch of properties. See here for a list of them.

I figure it ought to be as simple as this:
url.split("/")[2]

If you want to get domain name in JavaScript, just use the following code:
var domain_name = document.location.hostname;
alert(domain_name);
If you need to web page URL path so you can access web URL path use this example:
var url = document.URL;
alert(url);

What about this function?
window.location.hostname.match(/\w*\.\w*$/gi)[0]
This will match only the domain name regardless if its a subdomain or a main domain

for my case the best match is window.location.origin

Combining a few answers from the above, the following works really well for me for destroying Cookies:
/**
* Utility method to obtain the domain URI:
*/
fetchDomainURI() {
if (window.location.port.length > 0) {
return window.location.hostname;
}
return `.${window.location.hostname.match(/\w*\.\w*$/gi)[0]}`;
}
Works for IP addresses with ports, e.g., 0.0.0.0:8000 etc, as well as complex domains like app.staging.example.com returning .example.com => allows for cross-domain Cookie setting and destroying.

I'm new to JavaScript, but cant you just use: document.domain ?
Example:
<p id="ourdomain"></p>
<script>
var domainstring = document.domain;
document.getElementById("ourdomain").innerHTML = (domainstring);
</script>
Output:
domain.com
or
www.domain.com
Depending on what you use on your website.

Even if the question is about the domain name, the accepted solution includes the subdomain (eg. you get blog.example.com calling location.hostname).
For future reference I suggest a one-liner to extract only the domain (eg. https://blog.example.com/index.html -> example.com) as Micheal.
location.hostname.split('.').filter(( _, i) => i < 2).join('.')
Beware! It can break when the TLD is composed of two parts (eg. .co.uk). If that's your case change 2 with 3 in the code above.

you can use this to do away with the port number.
var hostname = window.location.host;
var urlWithoutPort = `https://${hostname}`;
console.log(urlWithoutPort);

https://publicsuffix.org/list/
(https://github.com/publicsuffix/list/blob/master/public_suffix_list.dat)
is needed to correctly parse out all domains without suffixes, working with dots as in the answers above will never completely be correct. Feel free to run the above codes samples against the public suffixes dat file to realize this.
You can roll your own code based on this or use a package like https://www.npmjs.com/package/tldts
getDomainWithoutSuffix('google.com'); // returns `google`
getDomainWithoutSuffix('fr.google.com'); // returns `google`
getDomainWithoutSuffix('fr.google.google'); // returns `google`
getDomainWithoutSuffix('foo.google.co.uk'); // returns `google`
getDomainWithoutSuffix('t.co'); // returns `t`
getDomainWithoutSuffix('fr.t.co'); // returns `t`
getDomainWithoutSuffix('https://user:password#example.co.uk:8080/some/path?and&query#hash'); // returns `example`