How to get substring after last specific character in JavaScript?

Question

I have a string test/category/1. I have to get substring after test/category/. How can I do that?

Answer 1

You can use String.slice with String.lastIndexOf:

var str = 'test/category/1';
str.slice(0, str.lastIndexOf('/') + 1);
// => "test/category/"
str.slice(str.lastIndexOf('/') + 1);
// => 1

Answer 2

The actual code will depend on whether you need the full prefix or the last slash. For the last slash only, see Pedro's answer. For the full prefix (and a variable PREFIX):

var PREFIX = "test/category/";
str.substr(str.lastIndexOf(PREFIX) + PREFIX.length);

Answer 3

You can use below snippet to get that

var str = 'test/category/1/4'
str.substring(str.lastIndexOf('/')+1)

Answer 4

A more complete compact ES6 function to do the work for you:

const lastPartAfterSign = (str, separator='/') => {
  let result = str.substring(str.lastIndexOf(separator)+1)
  return result != str ? result : false
}

const input = 'test/category/1'

console.log(lastPartAfterSign(input))
//outputs "1"

Answer 5

var str = 'test/category/1';
str.substr(str.length -1);