A string is any sequence of characters and can include leading, trailing, or intervening blank characters. Strings in some input fields must be represented differently, depending on whether the macro has been set to use the basic macro format or the advanced macro format. See Representation of strings and non-alphanumeric characters.

The following examples use the advanced macro format representation:
'Total number of users'
'   This string has 3 leading blanks.'
'This string has 3 trailing blanks.   '
Here are the same examples using the basic macro format representation:
Total number of users
   This string has 3 leading blanks.
This string has 3 trailing blanks.   
Notice that with the basic macro format, trailing blanks are still allowed but are difficult to detect. If in doubt, see the representation of the string in the source view.