15.3.9 Smalltalk Format Strings ------------------------------- Smalltalk format strings are described in the GNU Smalltalk documentation, class ‘CharArray’, methods ‘bindWith:’ and ‘bindWithArguments:’. <http://www.gnu.org/software/smalltalk/gst-manual/gst_68.html#SEC238>. In summary, a directive starts with ‘%’ and is followed by ‘%’ or a nonzero digit (‘1’ to ‘9’).