search and replace in strings

it’s been a while since i needed to do this. nice technique is to use ‘split’ to break the string into an array using the split’s arguments as the deliminator then ‘join’ to stick is back together using joins arg to put between each element. the effect is a search and replace

var str:String = "this is a string with some spaces that need replacing with _"
str = str.split(" ").join("_");
// simple :)