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read/get # value from url in PHP or Javascript

I'm currently developing a site in which a user can create a user area with a user directory created at registration such as myWebsite.com/user/myUserName
Now I've seen YouTube & TikTok (and presumably more) use an url like myWebsite.com/user/#myUserName (note the "#")
So my question is how do I read these? if a user visits myWebsite.com/user/#myUserName how do I read the # data?
I've searched many SO questions and Google before asking this and can't seen to find answers. only for standard url params or hashtags but not #, help!

Solution
You can use the window.location.pathname API to read the path name, parse it into an array and then filter out the only item that starts with an "#" character.
// take the entire path from the window and split them into an array with /
const paths = window.location.pathname.split('/')
// paths = ["","user","#myUserName"]
// pick out the first item in the array starting with an "#:
const userName = paths.find((item) => item.at(0) === "#")
// userName = "#myUserName"
Explanation
Firstly, you need to understand the structure of a URL https://developer.mozilla.org/en-US/docs/Learn/Common_questions/What_is_a_URL
Looking at your example, the user id should be part of the path. To get the entire path of /my-path/#user-id, you can use window.location.pathname (MDN reference).
From there on, you can parse the path to get the user id with JavaScript
Alternative Answer
Or you can just use Regex and capture anything that comes after "#"
const final = window.location.pathname.match("#.*").at(0)
// note: not a complete solution because it captures the other parts of the URL following the `/#username/` path

Using JavaScript and Regex to extract 1 specific data from URL

I would like to get from an URL like these JUST the "test#gmail.com" (or whatever email will be in the URL) :
www.website.com/?email=test#gmail.com
www.website.com/?email=test#gmail.com&name=john
www.website.com/?name=john&email=test#gmail.com
My problem is to solve that all of these 3 cases can happen (so no other data, OR data after the email, OR data before the email).
Unfortunately I have zero Regex-Skills, but was able to get so far together these 2 things:
/email=(.*)/
/email=(.*)\&/
The 1st one works if the email is the ONLY data.
The 2nd one works just if there is another data after my email.
But as mentioned I need to make it work regardless of which of the 3 types above is the case.
Could you help me out please?
Thank you very much!
BTW, I need it for this:
var msg = window.location.href.match(/email=(.*)/);
(I'm searching for an answer for more than 2 hours, used Google, used Regex-Testers, checked out Cheat Sheets and read many StackOverFlow-Questions... But I can't solve it on my own.)

Try this regex: https://regex101.com/r/gMyqDa/1
It matches email patterns not just any characters after email=

if your cases are that simple, then just exclude the ampersand
var urls = [
"www.website.com/?email=test#gmail.com",
"www.website.com/?email=test#gmail.com&name=john",
"www.website.com/?name=john&email=test#gmail.com"
];
for (i in urls) {
var url = urls[i];
console.log(url);
console.log(url.match(/email=[^&]+/)[0]);
}

Extracting from URL - Long URL

I'm currently trying to extract from ReturnUrl= ... I want to extract the URL from the link below using javascript. Can anyone help?
http://testdealbuilderCCMS/questionnaire.aspx?db_template_reference=Construction: Westfield Services Agreement&ContractDescription=Facilities Contract&NatureServices=FACILITIES&SiteDescription=Retail Units&ThirdPartyAgreementsList=&ServiceFee=1000&ReturnUrl=http://localhost:4965&launcher.aspx?directLink=PX&caseKey=7ccef65756504a79bc3a4a6687c0d9555e519ec9079241c9944c6a523704&PXid=

there are lots of edge cases here that will make this fail. So be careful, use this only if your string always ends with the ReturnURL parameter.
Find the position of the ReturnURL= in the string then get the substring from ReturnURL= position + ReturnURL= length, to the end.
http://jsfiddle.net/3hvajedg/1/
the_string = 'http://testdealbuilderCCMS/questionnaire.aspx?db_template_reference=Construction: Westfield Services Agreement&ContractDescription=Facilities Contract&NatureServices=FACILITIES&SiteDescription=Retail Units&ThirdPartyAgreementsList=&ServiceFee=1000&ReturnUrl=http://localhost:4965&launcher.aspx?directLink=PX&caseKey=7ccef65756504a79bc3a4a6687c0d9555e519ec9079241c9944c6a523704&PXid=';
alert(the_string.substring((the_string.indexOf('ReturnUrl=')+'ReturnUrl='.length)));

Only get the numbers out of an URL

I only want to have the numbers of my URL as return. At the moment I use:
alert(document.URL);
to get the whole URL. But is there any other easy solution to get only the ID-Numbers from my URL as result? I also use jQuery and PHP in this project.

var numbers = document.URL.match(/\d+/g) will return all numbers in a URL (eg for this thread) document.URL.match(/\d+/g) => ["19570840"]

alert(document.URL.match(/\d+/g));
Simple. I would put it in a fiddle, but uhh, jsFiddle doesn't have any numbers in their url, so.

JavaScript To Strip Page For URL

We have a javascript function we use to track page stats internally. However, the URLs it reports many times include the page numbers for search results pages which we would rather not be reported. The pages that are reports are of the form:
http://www.test.com/directory1/2
http://www.test.com/directory1/subdirectory1/15
http://www.test.com/directory3/1113
Instead we'd like the above reported as:
http://www.test.com/directory1
http://www.test.com/directory1/subdirectory1
http://www.test.com/directory3
Please note that the numbered 'directory' and 'subdirectory' names above are just for example purposes and that the actual subdirectory names are all different, don't necessarily include numbers at the end of the directory name, and can be many levels deep.
Currently our JavaScript function produces these URLs using the code:
var page = location.hostname+document.location.pathname;
I believe we need to use the JavaScript replace function in combination with some regex but I'm at a complete loss as to what that would look like. Any help would be much appreciated!
Thanks in advance!

I think you want this:
var page = location.href.substring(0,location.href.lastIndexOf("/"));

You can use a regex for this:
document.location.pathname.replace(/\/\d+$/, "");
Unlike substring and lastIndexOf solutions, this will strip off the end of the path if it consists of digits only.

What you can do is find the last index of "/" and then use the substring function.

Not sure you need a regex if you're just pulling off the last slash + content.
http://www.w3schools.com/jsref/jsref_lastIndexOf.asp
I'd probably use that to search for the last "/" character, then do a substring from the start of the string to that index.

How about this:
var page = location.split("/");
page.pop();
page = page.join("/");

I would think you need to use the .htaccess with rewrite rules to change the look of the url, however I am still looking to see if this is available to javascript. Will repost when I find out more
EDIT*
the lastIndexOf would only give you the position, therefor you would still need to replace. ex:
var temp = page.substring(page.lastIndexOf("/"),page.length-1);
page = page.replace(temp, "");
unfortunately I'm not that advanced in my coding so there is probably more efficient coding in the other answers. Sorry for any inconveniences with my initial answer.