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How can I make a page that look for URL and create a text that refer to the URL?

So it's kind of a dumb question but I'm really wondering how I can make this :
user type www.mydomaine.com/something
page display : something
and it does with anything he type after the domain name
I've no idea how I could do that. I know I can get an info from an URL with jQuery but how can i remove the thing like index.html in the url? My guess would be with the htaccess?
Also, there won't be any other page but this with some design, how can I make sure someone doesn't go anywhere else but on the page that display what he wrote after the domain name?
I hope that's clear, thanks for reading and your answers !
Pierre

When creating an anchor tag and adding an href (or making a URL) I needed the URL to have a protocol (http or https), so I made a validation to add it, and then you can access the parameters of the URL easier.
Also, if you want to remove the / from the pathname you can use a .replace('/', '') when using parser.pathname
For removing index.html from the URL, you can split the path and get only the first element, or the ones you need f.e. parser.pathname.split('/')[0]
var myUrl = "www.mydomaine.com/something"
if (!myUrl.startsWith('http')) myUrl = 'http://' + myUrl;
var parser = document.createElement('a');
parser.href = myUrl;
console.log(parser.pathname);
// Other option
var theUrl = new URL(myUrl);
console.log(theUrl.pathname);
I used this as a reference.

Url in the Address bar with php, or javascript

.htaccess
RewriteRule ^info/{0,1}$ index.php?page=info [QSA,L]
RewriteRule ^login/{0,1}$ index.php?page=login [QSA,L]
the same : index = index/
RewriteRule ^info/?$ $1
RewriteRule ^login/?$ $1
javascript:
reg_e=/#$/; if(!window.location.href.match(reg_e)) {
window.location.href = decodeURIComponent(window.location.href)+"#";}
it's working... good
I have problem that
when someone try to add '/' or any at the final url http://example.com/info/# will return http://example.com/info# or http://example.com/info/# but page will change nothing ?
Can you help me establish any rules for none breaking web addresses at ends of lines?
example : http://example.com/info# <- base url
http://example.com/info/# to be => http://example.com/info#
or : http://example.com/info/# <= or if anyone add '/#-' e.tc. the web will be nothing change.
And when I click 'info' and add '/' [http://example.com/info/#, it's ok. but i click other link it will be :
http://example.com/info/login# <- RewriteRule ^login/?$ $1
instead of: [http://example.com/login/#
if remove #RewriteRule ^login/?$ $1 ->> http://example.com/login# when add '/' handle => css wont load.
'info' and 'login are the same level in index folder.
i'd tried "<base href='/' /> but not working.
how to have a safe url? thanks your opions.

I am not 100% sure what you want here but it seems as though you want a link to redirect from base URL and not the relative URL.
Say your link is this:
Login
Try this instead
Login
The / at the beginning will say to go back to the base URL and start from there. Let me know if I missed the point completely though :)

Extract URL's directory from path, without file name such as "index.html"

I am looking for plain JavaScript code (no jQuery etc.) to learn the directory path component of my currently loaded page's URL.
For instance, if my page is loaded as "http://localhost/myapp/index.html", I like to end up with "http://localhost/myapp/".
I need this in order to create the path to a different file in the same location, e.g. to "http://localhost/myapp/other.html".

It looks like this does the trick:
var href = window.location.href;
var dir = href.substring(0, href.lastIndexOf('/')) + "/";
Is this a safe method or can this fail with more complex URLs?

Highlighting the comment in the question that helped me:
Phylogenesis's comment:
The simple solution is location.href.replace(/[^/]*$/, ''); then.

One more option to consider, which has the benefit that any query string will not be an issue since window.location.pathname does not pick up the query string.
window.location.origin + window.location.pathname.slice(0, window.location.pathname.lastIndexOf('/'))

A better solution would be
location.href.replace(/\/[^\/]+?\.[^\/]+?$/, '/')

Replace subdomain name with other subdomain Using JavaScript?

I'm trying to replace the subdomain name from "news.domain.com/path/.." to "mobile.domain.com/path/..", using JavaScript
Any idea how to achieve this?

I'm assuming that you want to change a string in the generic format xxxx.domain.com/... into mobile.domain.com/.... This regexp should do it in JavaScript:
var oldPath = "news.domain.com/path/";
var newPath = oldPath.replace(/^[^.]*/, 'mobile')

This should work in normal cases:
"http://news.domain.com/path/..".replace(/(:\/\/\w+\.)/, "://mobile.")
Use following to add an extra level of validation:
function replaceSubdomain(url, toSubdomain) {
const replace = "://" + toSubdomain + ".";
// Prepend http://
if (!/^\w*:\/\//.test(url)) {
url = "http://" + url;
}
// Check if we got a subdomain in url
if (url.match(/\.\w*\b/g).length > 1) {
return url.replace(/(:\/\/\w+\.)/, replace)
}
return url.replace(/:\/\/(\w*\.)/, `${replace}$1`)
}
console.log(replaceSubdomain("example.com", "mobile"));
console.log(replaceSubdomain("http://example.com:4000", "mobile"));
console.log(replaceSubdomain("www.example.com:4000", "mobile"));
console.log(replaceSubdomain("https://www.example.com", "mobile"));
console.log(replaceSubdomain("sub.example.com", "mobile"));

If you want to send user to new url via JS - use document.location = "mobile.domain.com/path/..".

In reference to FixMaker's comment on his answer:
window.location.href will give you a fully qualified URL (e.g. http://news.domain.com/path). You'll need to take into account the http:// prefix when running the above code
A suitable regular expression to handle the request scheme (http/https) is as follows:
function replaceSubdomain(url, subdomain){
return url.replace(/^(https?:\/\/)(www\.)?([^.])*/, `$1$2${subdomain}`);
}
let url1 = 'https://sub-bar.main.com';
let url2 = 'https://www.sub-bar.main.com';
console.log(replaceSubdomain(url1, 'foobar'));
console.log(replaceSubdomain(url2, 'foobar'));

You cannot replace a subdomain. You can redirect using javascript.
<script type="text/javascript">
<!--
window.location = "http://mobile.domain.com/path/to/file.html"
//-->
</script>

I tried using java script but no luck and for my case i use the below code in .httaccess file
RewriteCond %{HTTP_USER_AGENT} "iphone|ipod|android" [NC]
RewriteCond %{HTTP_HOST} !^mobile.domain.com
RewriteRule ^(.*)$ http://mobile.domain.com/ [L,R=302]
it will replace "news" sub domain to "mobile" sub domain. hope it will help any one.

How to go to url in same server without setting complete url address - JavaScript (with/without) jQuery

I know how to go to link / url / address, like;
window.location = "www.example.com/index.html";
or
document.location.href="www.example.com/index.html";
But suppose I want to navigate from index1.html to index2.html, how can i achieve this without providing the www.example.com/ prefix? Please don't suggest that I set www.example.com/ in a global variable / constant. The address may change to www.example2.com/subfolder1/subfolder2/ to www.examplea.com/.... The mentioned methods works only in the case of root pages. I mean, providing document.location.href="index.html"; will navigate the browser to rootdomain/index.html, even if I am staying in rootdomain/section1/section2/somepage.html. But I want to navigate to rootdomain/section1/section2/index.html
How can I achieve this by providing just the page name?

If you have a / at the beginning of your string, it'll go to the local page:
window.location = "/index.html"

Just like you would do otherwise, but using the relative path:
document.location.href = '/index2.html'; //relative path

window.location.pathname = 'index2.html';
You can also just use relative urls on the document.location.href.
What might be even better is window.location.assign('index2.html');. This is especially useful when you're at www.example.com/foo/.../index1.html and don't want to specify the whole path to get to www.example.com/foo/.../index2.html.
For more options, see https://developer.mozilla.org/en-US/docs/DOM/window.location .