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Remove some part of URL using javascript

I have a URL which will be something like below
http://localhost:22306/NESSPATH/VSAT/I-HP-AAMB-ENB-0003_C1//Panaromic//120.jpg
I want URL which will be something like this
NESSPATH/VSAT/I-HP-AAMB-ENB-0003_C1//Panaromic//120.jpg
Here is what I get in variable
VSATSaving.PANAROMIC_120 = document.getElementById('ImgPanaromic120').src;
how to get that using javascript. Tried with lastIndexOf but it is not working

You can create a new URL object and use the pathname property to extract the data.
const myUrl = new URL(document.getElementById('ImgPanaromic120').src);
console.log(myUrl.pathname);
<img id="ImgPanaromic120" src="http://localhost:22306/NESSPATH/VSAT/I-HP-AAMB-ENB-0003_C1//Panaromic//120.jpg"/>

var a = document.createElement('a');
a.href = 'http://localhost:22306/NESSPATH/VSAT/I-HP-AAMB-ENB-0003_C1//Panaromic//120.jpg';
console.log(a.pathname);

window.location.pathname will give you path.

You can simply use window.location.pathname since this is a url.
For other strings, you can use indexOf, split, substring and many of the other string functions.
//example using `split`
var str = "http://localhost:22306/NESSPATH/VSAT/I-HP-AAMB-ENB-0003_C1//Panaromic//120.jpg";
var paths = str.split("http://localhost:22306/")
console.log(paths[1]);

JavaScript parameters from URL

var url = window.location.href;
result:
https://test.com/index.html?Event=90000002
how do I use Javascript to get 90000002 and put it in a variable?

You can use the .split() method
var data=url.split("=")[1]
Should return what you got after '='

Though this is not optimized way but you can still do like this
Use location object and it's search property.
location.search will return ?Event=90000002. Then use substring to get the value
var a = location.search;
console.log(a.substring(7,a.length))

Split URL and Query Strings

I want to get the part of a URL after the last / and before the querystring.
So far I had the last part of the URL, but I wasn't able to remove the querystring from the URL.
The Javascript:
<script type='text/javascript'>
var url = window.location.href;
var array = url.split('/');
var lastsegment = array[array.length-1];
document.write(lastsegment);
</script>
The structure of the URL is like this:
http://www.example.com/search/People?&results=latest
I only need the People part. How could that be possible within the above Javascript?
Or is there any better way to do that?

Try using window.location.pathname instead of window.location.href. It gets only the text between the server name and the query string (which is "/search/People" in your case):
var last_part = window.location.pathname.split('/').pop();
You can read more about pathname here.

Read Window.location
window.location.pathname.split('/').pop();
.pop()

your code does the right thing, you could remove query strings by amending it a bit as;
var lastsegment = array[array.length-1];
if(lastsegment.indexOf('?'))
lastsegment = lastsegment.split('?')[0];
UPDATE:
To handle the case if there are no query string embedded at all.

If you want to parse an URL from another origin than window.location :
var test = 'http://www.example.com/search/People?&results=latest';
var parts = test.split('/');
lastPart = parts[parts.length-1].split('?')[0];
lastPart is now "People"

How to select a part of a string with a RegExp and reuse it in a variable

I have this RegExp: var myReg = RegExp("https?://www.youtube.com/watch\?v=[^\"]+",""); to find the youtube link within a string. I then want to make the part of the string matching the RegExp a variable; lets say var url = "part of string matching the RegExp"
then I coudl do something like window.location = url; to redirect the browser directly to the video page. Thanks

You only have to access the first element of the result, if any:
var r = string.match(myReg);
if(r) var url = r[0];
Take care because is you dont find the url, the result will be a null value

This should do the trick:
myReg.exec(str);
var url = RegExp.lastMatch;
Udi

Get values from hash in URL using jquery

If I re-rite the URL using :
var id = 150
window.location.hash = "id="+id;
how to get the value of id using jQuery ?

No jQuery needed..
var id = /^#?id=(.+)/.exec(location.hash);
id = id ? id[1] : '';
// OR
var id = location.hash.substr(4); // (when hash can only be #id=..)
// This also selects 123 in #no=123 (!)

+1 for Rob W's answer not to use jQuery for this. But there're two things, i'd like to point out.
1.) Executing a regular expression, plus using a tertiary operator is "overload", too. ;-)
2.) You should consider that some browers return the hash symbol, and some don't!
To avoid to truncate the actual value part, I'd say it's safer to use replace(), instead of substr():
var id = location.hash.replace('id=', '').replace('#', '');
UPDATE:
I think split() is an even better solution:
var id = location.hash.split('id=')[1];
Just one (native) function call, which also "checks" if the request URL actually contains a hash that contains the string "id=idString".
If it does, the value of var id is "idString". If not, value of var id is undefined.