JSFiddle - React, Tailwind, and code Playground

JavaScript

var v = 'some\\thing\\text.txt';
var x ='';
for(i=v.length-1;i>=0;i--)
  if(v[i]!='/' && v[i]!='\\')
    x = v[i]+x;
  else 
    break;
console.log(x);