Moves the ending character position of a range while any of the specified characters are found in the document.
While any character in Cset is found, the end position of the specified range is moved. This method returns the number of characters that the end position of the range moved as a Long value. If no Cset characters are found, the range isn't changed and the method returns 0 (zero). If the end position is moved backward to a point that precedes the original start position, the start position is set to the new end position.
Selection.Range.MoveEndWhile Cset:=" ", Count:=wdForward
The following argument is optional
Count - The maximum number of characters by which the range is to be moved. Can be a number or either the wdForward or wdBackward constant. If Count is a positive number, the range is moved forward in the document. If it is a negative number, the range is moved backward. The default value is wdForward