String.toUpperCase()
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Syntax
myString.toUpperCase()

Arguments
none

Returns
The specified string in all upper-case.

Description
Method: Returns the specified string with all lower-case characters converted into upper-case characters.

Sample
onLoad () {
  str = "Hello World, how are YOU doing?";
  str = str.toLowerCase();
  trace(str);  // returns "HELLO WORLD, HOW ARE YOU DOING?"
}