[Флэш Потрошитель]

myString = "abrakadabra";
oldChar = "a";
newChar = "i";
indexOfOldChar = myString.indexOf(oldChar);
while(indexOfOldChar != -1)
{
	myString = myString.substring(0,indexOfOldChar) + newChar + myString.substring(indexOfOldChar+1);
	indexOfOldChar = myString.indexOf(oldChar);
}

trace("String = " + myString); // ibrikidibri