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How to strip / replace something from a URL?

I have this URL
http://192.168.22.124:3000/temp/box/c939c38adcf1873299837894214a35eb
I want to replace the last part of my URL which is c939c38adcf1873299837894214a35eb with something else.
How can I do it?

Try this:
var url = 'http://192.168.22.124:3000/temp/box/c939c38adcf1873299837894214a35eb';
somethingelse = 'newhash';
var newUrl = url.substr(0, url.lastIndexOf('/') + 1) + somethingelse;
Note, using the built-in substr and lastIndexOf is far quicker and uses less memory than splitting out the component parts to an Array or using a regular expression.

You can follow this steps:
split the URL with /
replace the last item of array
join the result array using /
var url = 'http://192.168.22.124:3000/temp/box/c939c38adcf1873299837894214a35eb';
var res = url.split('/');
res[res.length-1] = 'someValue';
res = res.join('/');
console.log(res);

Using replace we can try:
var url = "http://192.168.22.124:3000/temp/box/c939c38adcf1873299837894214a35eb";
var replacement = 'blah';
url = url.replace(/(http.*\/).*/, "$1" + replacement);
console.log(url);
We capture everything up to and including the final path separator, then replace with that captured fragment and the new replacement.

Complete guide:
// url
var urlAsString = window.location.href;
// split into route parts
var urlAsPathArray = urlAsString.split("/");
// create a new value
var newValue = "routeValue";
// EITHER update the last parameter
urlAsPathArray[urlAsPathArray.length - 1] = newValue;
// OR replace the last parameter
urlAsPathArray.pop();
urlAsPathArray.push(newValue);
// join the array with the slashes
var newUrl = urlAsPathArray.join("/");
// log
console.log(newUrl);
// output
// http://192.168.22.124:3000/temp/box/routeValue

You could use a regular expression like this:
let newUrl = /^.*\//.exec(origUrl)[0] + 'new_ending';

How to split a word for getting a specific value in Javascript or Jquery? [duplicate]

How do I get the last segment of a url? I have the following script which displays the full url of the anchor tag clicked:
$(".tag_name_goes_here").live('click', function(event)
{
event.preventDefault();
alert($(this).attr("href"));
});
If the url is
http://mywebsite/folder/file
how do I only get it to display the "file" part of the url in the alert box?

You can also use the lastIndexOf() function to locate the last occurrence of the / character in your URL, then the substring() function to return the substring starting from that location:
console.log(this.href.substring(this.href.lastIndexOf('/') + 1));
That way, you'll avoid creating an array containing all your URL segments, as split() does.

var parts = 'http://mywebsite/folder/file'.split('/');
var lastSegment = parts.pop() || parts.pop(); // handle potential trailing slash
console.log(lastSegment);

window.location.pathname.split("/").pop()

The other answers may work if the path is simple, consisting only of simple path elements. But when it contains query params as well, they break.
Better use URL object for this instead to get a more robust solution. It is a parsed interpretation of the present URL:
Input:
const href = 'https://stackoverflow.com/boo?q=foo&s=bar'
const segments = new URL(href).pathname.split('/');
const last = segments.pop() || segments.pop(); // Handle potential trailing slash
console.log(last);
Output: 'boo'
This works for all common browsers. Only our dying IE doesn't support that (and won't). For IE there is a polyfills available, though (if you care at all).

Just another solution with regex.
var href = location.href;
console.log(href.match(/([^\/]*)\/*$/)[1]);

Javascript has the function split associated to string object that can help you:
const url = "http://mywebsite/folder/file";
const array = url.split('/');
const lastsegment = array[array.length-1];

Shortest way how to get URL Last Segment with split(), filter() and pop()
function getLastUrlSegment(url) {
return new URL(url).pathname.split('/').filter(Boolean).pop();
}
console.log(getLastUrlSegment(window.location.href));
console.log(getLastUrlSegment('https://x.com/boo'));
console.log(getLastUrlSegment('https://x.com/boo/'));
console.log(getLastUrlSegment('https://x.com/boo?q=foo&s=bar=aaa'));
console.log(getLastUrlSegment('https://x.com/boo?q=foo#this'));
console.log(getLastUrlSegment('https://x.com/last segment with spaces'));
Works for me.

Or you could use a regular expression:
alert(href.replace(/.*\//, ''));

var urlChunks = 'mywebsite/folder/file'.split('/');
alert(urlChunks[urlChunks.length - 1]);

Returns the last segment, regardless of trailing slashes:
var val = 'http://mywebsite/folder/file//'.split('/').filter(Boolean).pop();
console.log(val);

I know, it is too late, but for others:
I highly recommended use PURL jquery plugin. Motivation for PURL is that url can be segmented by '#' too (example: angular.js links), i.e. url could looks like
http://test.com/#/about/us/
or
http://test.com/#sky=blue&grass=green
And with PURL you can easy decide (segment/fsegment) which segment you want to get.
For "classic" last segment you could write:
var url = $.url('http://test.com/dir/index.html?key=value');
var lastSegment = url.segment().pop(); // index.html

Get the Last Segment using RegEx
str.replace(/.*\/(\w+)\/?$/, '$1');
$1 means using the capturing group. using in RegEx (\w+) create the first group then the whole string replace with the capture group.
let str = 'http://mywebsite/folder/file';
let lastSegment = str.replace(/.*\/(\w+)\/?$/, '$1');
console.log(lastSegment);

Also,
var url = $(this).attr("href");
var part = url.substring(url.lastIndexOf('/') + 1);

Building on Frédéric's answer using only javascript:
var url = document.URL
window.alert(url.substr(url.lastIndexOf('/') + 1));

If you aren't worried about generating the extra elements using the split then filter could handle the issue you mention of the trailing slash (Assuming you have browser support for filter).
url.split('/').filter(function (s) { return !!s }).pop()

window.alert(this.pathname.substr(this.pathname.lastIndexOf('/') + 1));
Use the native pathname property because it's simplest and has already been parsed and resolved by the browser. $(this).attr("href") can return values like ../.. which would not give you the correct result.
If you need to keep the search and hash (e.g. foo?bar#baz from http://quux.com/path/to/foo?bar#baz) use this:
window.alert(this.pathname.substr(this.pathname.lastIndexOf('/') + 1) + this.search + this.hash);

To get the last segment of your current window:
window.location.href.substr(window.location.href.lastIndexOf('/') +1)

you can first remove if there is / at the end and then get last part of url
let locationLastPart = window.location.pathname
if (locationLastPart.substring(locationLastPart.length-1) == "/") {
locationLastPart = locationLastPart.substring(0, locationLastPart.length-1);
}
locationLastPart = locationLastPart.substr(locationLastPart.lastIndexOf('/') + 1);

var pathname = window.location.pathname; // Returns path only
var url = window.location.href; // Returns full URL
Copied from this answer

// Store original location in loc like: http://test.com/one/ (ending slash)
var loc = location.href;
// If the last char is a slash trim it, otherwise return the original loc
loc = loc.lastIndexOf('/') == (loc.length -1) ? loc.substring(0,loc.length-1) : loc.substring(0,loc.lastIndexOf('/'));
var targetValue = loc.substring(loc.lastIndexOf('/') + 1);
targetValue = one
If your url looks like:
http://test.com/one/
or
http://test.com/one
or
http://test.com/one/index.htm
Then loc ends up looking like:
http://test.com/one
Now, since you want the last item, run the next step to load the value (targetValue) you originally wanted.
var targetValue = loc.substr(loc.lastIndexOf('/') + 1);
// Store original location in loc like: http://test.com/one/ (ending slash)
let loc = "http://test.com/one/index.htm";
console.log("starting loc value = " + loc);
// If the last char is a slash trim it, otherwise return the original loc
loc = loc.lastIndexOf('/') == (loc.length -1) ? loc.substring(0,loc.length-1) : loc.substring(0,loc.lastIndexOf('/'));
let targetValue = loc.substring(loc.lastIndexOf('/') + 1);
console.log("targetValue = " + targetValue);
console.log("loc = " + loc);

Updated raddevus answer :
var loc = window.location.href;
loc = loc.lastIndexOf('/') == loc.length - 1 ? loc.substr(0, loc.length - 1) : loc.substr(0, loc.length + 1);
var targetValue = loc.substr(loc.lastIndexOf('/') + 1);
Prints last path of url as string :
test.com/path-name = path-name
test.com/path-name/ = path-name

I am using regex and split:
var last_path = location.href.match(/./(.[\w])/)[1].split("#")[0].split("?")[0]
In the end it will ignore # ? & / ending urls, which happens a lot. Example:
https://cardsrealm.com/profile/cardsRealm -> Returns cardsRealm
https://cardsrealm.com/profile/cardsRealm#hello -> Returns cardsRealm
https://cardsrealm.com/profile/cardsRealm?hello -> Returns cardsRealm
https://cardsrealm.com/profile/cardsRealm/ -> Returns cardsRealm

I don't really know if regex is the right way to solve this issue as it can really affect efficiency of your code, but the below regex will help you fetch the last segment and it will still give you the last segment even if the URL is followed by an empty /. The regex that I came up with is:
[^\/]+[\/]?$

I know it is old but if you want to get this from an URL you could simply use:
document.location.pathname.substring(document.location.pathname.lastIndexOf('/.') + 1);
document.location.pathname gets the pathname from the current URL.
lastIndexOf get the index of the last occurrence of the following Regex, in our case is /.. The dot means any character, thus, it will not count if the / is the last character on the URL.
substring will cut the string between two indexes.

if the url is http://localhost/madukaonline/shop.php?shop=79
console.log(location.search); will bring ?shop=79
so the simplest way is to use location.search
you can lookup for more info here
and here

You can do this with simple paths (w/0) querystrings etc.
Granted probably overly complex and probably not performant, but I wanted to use reduce for the fun of it.
"/foo/bar/"
.split(path.sep)
.filter(x => x !== "")
.reduce((_, part, i, arr) => {
if (i == arr.length - 1) return part;
}, "");
Split the string on path separators.
Filter out empty string path parts (this could happen with trailing slash in path).
Reduce the array of path parts to the last one.

Adding up to the great Sebastian Barth answer.
if href is a variable that you are parsing, new URL will throw a TypeError so to be in the safe side you should try - catch
try{
const segments = new URL(href).pathname.split('/');
const last = segments.pop() || segments.pop(); // Handle potential trailing slash
console.log(last);
}catch (error){
//Uups, href wasn't a valid URL (empty string or malformed URL)
console.log('TypeError ->',error);
}

I believe it's safer to remove the tail slash('/') before doing substring. Because I got an empty string in my scenario.
window.alert((window.location.pathname).replace(/\/$/, "").substr((window.location.pathname.replace(/\/$/, "")).lastIndexOf('/') + 1));

Bestway to get URL Last Segment Remove (-) and (/) also
jQuery(document).ready(function(){
var path = window.location.pathname;
var parts = path.split('/');
var lastSegment = parts.pop() || parts.pop(); // handle potential trailing slash
lastSegment = lastSegment.replace('-',' ').replace('-',' ');
jQuery('.archive .filters').before('<div class="product_heading"><h3>Best '+lastSegment+' Deals </h3></div>');
});

A way to avoid query params
const urlString = "https://stackoverflow.com/last-segment?param=123"
const url = new URL(urlString);
url.search = '';
const lastSegment = url.pathname.split('/').pop();
console.log(lastSegment)

Get substring between two last instances of character in url

I have urls which look like this :http://i1.ytimg.com/vi/BR0Y3MZ21bo/0.jpg. Can someone help me extract the "ID" BR0Y3MZ21bo between the last two slashes in the url?

You can use split(), split will give you array of string being separated by / and your desired string is at second last index of array.
Live Demo
arr = url.split('/');
arr[arr.length-2];

Try this:
var url = 'http://i1.ytimg.com/vi/BR0Y3MZ21bo/0.jpg'; // window.location.href;
var page = url.substr(0, url.lastIndexOf('/')); // output -> http://i1.ytimg.com/vi/BR0Y3MZ21bo
var str = page.substr(page.lastIndexOf('/')+1); // output -> BR0Y3MZ21bo
alert(str); // BR0Y3MZ21bo
FIDDLE

I need to match a certain part of url path using Regex and Javascript

I have the following link:
sitename.com/Default.aspx?PageID=13078494
I want to grab the following: "PageID=13078494". This is what I have so far:
var url = "sitename.com/Default.aspx?PageID=13078494";
urlmatch = url.match([PageID=13078494]);
urlmatch[0];
Is this the proper expression for what I'm trying to do?

Your regex and its syntax are wrong.
A better way would be to not use a regex at all. Use .split() instead:
var urlmatch = url.split('?')[1];
Here's the fiddle: http://jsfiddle.net/qpXNU/

var myregexp = /[?&]PageID=(\d+)/i;
var match = myregexp.exec(url);
if (match != null) {
//This is if your match it successful
result = match[1];
} else {
//This is if url doesn't match
result = "";
}
This one will work regardless of where PageID is. It will match
sitename.com/Default.aspx?PageID=13078494
anything.org/Default.aspx?PageID=13078494
sitename.com/Default.aspx?foo=bar&PageID=13078494
sitename.com/Default.html?foo=bar&PageID=13078494&bar=foo
Default.html?foo=bar&PageID=13078494&bar=foo
Importantly, it WON'T match
sitename.com/Default.aspx?NotThePageID=13078494
Or without the checking, simply
url.match(/[?&]PageID=(\d+)/i)[1], but I'd advice against that unless your SURE it will always match.

Try the following regex, which will extract the PageID and place it in the first match group:
var url = "sitename.com/Default.aspx?PageID=13078494";
urlmatch = url.match(/PageID=(\d+)/);
alert(urlmatch[1]);​ // 13078494

If you are matching specific value, then it's fine, otherwise use below to match any number of digits in pageID:
/PageID=\d+/
as:
var url = "sitename.com/Default.aspx?PageID=13078494";
var urlmatch = url.match(/PageID=\d+/);
alert(urlmatch[0]);
or to match 8 exact digits in pageID, use:
/PageID=\d{8}/
as:
var url = "sitename.com/Default.aspx?PageID=13078494";
var urlmatch = url.match(/PageID=\d{8}/);
alert(urlmatch[0]);

When it comes to handling URLs, the browser is pretty good.
You should convert your string to an actual URL like so:
var toURL = function (href) {
var a = document.createElement('a');
a.href = href;
return a;
};
Now use the browser's built-in parsing capabilities:
var url = toURL('sitename.com/Default.aspx?PageID=13078494');
alert(url.search);

How can I change the last component of a url path?

"http://something.com:6688/remote/17/26/172"
if I have the value 172 and I need to change the url to 175
"http://something.com:6688/remote/17/26/175"
how can i do that in JavaScript?

var url = "http://something.com:6688/remote/17/26/172"
url = url.replace(/\/[^\/]*$/, '/175')
Translation: Find a slash \/ which is followed by any number * of non slash characters [^\/] which is followed by end of string $.

Split the String by /, remove the last part, rejoin by /, and add the new path
newurl = url.split('/').slice(0,-1).join('/')+'/175'

new URL("175", "http://something.com:6688/remote/17/26/172").href
This also works with paths, e.g.
new URL("../27", "http://something.com:6688/remote/17/26/172").href → "http://something.com:6688/remote/17/27"
new URL("175/1234", "http://something.com:6688/remote/17/26/172").href → "http://something.com:6688/remote/17/26/175/1234"
new URL("/local/", "http://something.com:6688/remote/17/26/172").href →
"http://something.com:6688/local/"
See https://developer.mozilla.org/en-US/docs/Web/API/URL/URL for details.

Split the String by / then change the last part and rejoin by /:
var newnumber = 175;
var url = "http://something.com:6688/remote/17/26/172";
var segements = url.split("/");
segements[segements.length - 1] = "" + newnumber;
var newurl = segements.join("/");
alert(newurl);
Try it!

Depends on what you want to do.
Actually change browser URL:
If you actually want to push the browser to another URL you'll have to use window.location = 'http://example.com/175'.
Change browser URL hash
If you just want to change the hash you can simply use window.location.hash.
Re-use the URL on links or similar
If you want to reference a URL in links or similar, look into George's answer.

//Alternative way.
var str = window.location.href;
var lastIndex = str.lastIndexOf("/");
var path = str.substring(0, lastIndex);
var new_path = path + "/new_path";
window.location.assign(new_path);