function stripSpaces($myString:String):String
{
	return $myString.split(" ").join("");
}


var originalStr:String = "   A   B   C  D     E   F   G    ";
trace("originalStr: "+originalStr);
var withNoSpacesStr:String = stripSpaces(originalStr);
trace("withNoSpacesStr: "+withNoSpacesStr);

// OUTPUT
// originalStr:    A   B   C  D     E   F   G    
// withNoSpacesStr: ABCDEFG

AS3 Strip Spaces from a String

ActionScript 3