JSFiddle - React, Tailwind, and code Playground

JavaScript

var str = "#flt_man100,flt_man234,flt_man334,flt_manABC,";
var regex = /flt_man([^,]*)/g;

var result; 
var arr = new Array();
while( result = regex.exec(str) ){
    arr.push(result[1]);
}
console.log(arr);