AS3 - String replacement utility function.

StringUtil.replace.as

function replace( str:String, search:String, replacement:String ):String {
	var a:int = search.length;
	var b:int = replacement.length;
	var o:int = 0;
	var i:int;
	while( ( i = str.indexOf( search, o ) ) != -1 ) {
		str = str.substr( 0, i ) + replacement + str.substr( i + a );
		o = i + b;
	}
	return str;
}