JS remove everything after the last occurrence of a character

Question

Okay I have this

var URL = \"http://stackoverflow.com/questions/10767815/remove-everything-before-the-last-occurrence-of-a-character\";
console.log(URL.subst         


        

Answer 1

Try utilizing .match() with RegExp /^\w+.*\d+\//

var URL = "http://stackoverflow.com/questions/10767815/remove-everything-before-the-last-occurrence-of-a-character";
var res = URL.match(/^\w+.*\d+\//)[0];
document.body.textContent = res;

Answer 2

var URL = "http://stackoverflow.com/questions/10767815/remove-everything-before-the-last-occurrence-of-a-character";

console.log(URL.substring(0,URL.lastIndexOf('/')+1));
//The +1 is to add the last slash

Answer 3

Try an array based extraction like

var URL = "http://stackoverflow.com/questions/10767815/remove-everything-before-the-last-occurrence-of-a-character";
snippet.log(URL.split('/').slice(0, 5).join('/'));

<!-- Provides the `snippet` object, see http://meta.stackexchange.com/a/242144/134069 -->
<!-- To show result in the dom instead of console, only to be used in the snippet not in production -->
<script src="http://tjcrowder.github.io/simple-snippets-console/snippet.js"></script>

Answer 4

Generic solution

This is a generic function that also handles the edge case when the searched character or string (needle) is not found in the string we are searching in (haystack). It returns the original string in that case.

function trimStringAfter(haystack, needle) {
  const lastIndex = haystack.lastIndexOf(needle)
  return haystack.substring(0, lastIndex === -1 ? haystack.length : lastIndex + 1)
}

console.log(trimStringAfter('abcd/abcd/efg/ggfbf', '/')) // abcd/abcd/efg/
console.log(trimStringAfter('abcd/abcd/abcd', '/')) // abcd/abcd/
console.log(trimStringAfter('abcd/abcd/', '/')) // abcd/abcd/
console.log(trimStringAfter('abcd/abcd', '/')) // abcd/
console.log(trimStringAfter('abcd', '/')) // abcd

Answer 5

Seems like a good case for a regular expression (can't believe no one has posted it yet):

URL.replace(/[^\/]+$/,'')

Removes all sequential non–forward slash characters to the end of the string (i.e. everything after the last /).

Answer 6

Here you are:

var URL = "http://stackoverflow.com/questions/10767815/remove-everything-before-the-last-occurrence-of-a-character";
alert(URL.substring(0, URL.lastIndexOf("/") + 1));

Hope this helps.