JS RegExp Examples

Remove all ending characters matching a given pattern on a string

var str = 'FFA0000000'; // Our starting string where we want to remove all '00' 
var reg = /[0]{2,2}$/;
var match = reg.exec(str);
while(match = reg.exec(str)){
   var x = str.split('');
   x.splice(match.index,2);
   str = x.join('');
   console.log(str, match)
}

// Loop 1: FFA00000 ["00", index: 8, input: "FFA0000000", groups: undefined]
// Loop 2: FFA000 ["00", index: 6, input: "FFA00000", groups: undefined]
// Loop 3: FFA0 ["00", index: 4, input: "FFA000", groups: undefined]

Result: FFA0