如何在 JavaScript 中的最后一个特定字符之后获取子字符串？

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

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

Answer 5

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 6

var str = "test/category/1";
pre=test/category/;
var res = str.substring(pre.length);

Answer 7

You can use the indexOf() and slice()

 function after(str, substr) { return str.slice(str.indexOf(substr) + substr.length, str.length); } // Test: document.write(after("test/category/1", "test/category/"))

Answer 8

You can use str.substring(indexStart(, indexEnd)):

var str = 'test/category/1';
var ln=str.length;
alert(str.substring(ln-1,ln));