Javascript regex for getting string before question mark if present

Question

I have this string: #test or #test?params=something

var regExp = /(^.*)?\?/; 
var matches = regExp.exec($(this).data('target'));
var target = matches[1];
console.log(target);

I always need to get only #test. The function I pasted returns an error if no question mark is found. The goal is to always return #test whether there are additional params or not. How do I make a regex that returns this?

Answer 1

Is that string direct from the current page's URL?

If so, you can simply use:

window.location.hash.split('?')[0]

If you're visiting http://example.com/#test?params=something, the above code will return "#test".

Tests

example.com/#test                     -> "#test"
example.com/#test?params=something    -> "#test"
example.com/foo#test                  -> "#test"
example.com                           -> ""

Answer 2

^(.*?)(?=\?|$)

You can try this.See demo.

https://regex101.com/r/vN3sH3/25