Counts the number of words inside string.
            If the optional format is not specified, then
            the return value will be an integer representing the number of words
            found. In the event the format is specified, the return
            value will be an array, content of which is dependent on the
            format. The possible value for the
            format and the resultant outputs are listed below.
        
For the purpose of this function, 'word' is defined as a locale dependent string containing alphabetic characters, which also may contain, but not start with "'" and "-" characters.

