code: def t_trailingwhitespace(self, token):
          ur'.+? \n'
          print "Error: trailing whitespace at line %s in text '%s'" % (token.lexer.lineno + 1, token.value[:-1])
          token.lexer.lexerror = True
          token.lexer.skip(1f t_trailingwhitespace(self, token):
          ur'.+? \n'
          print "Error: trailing whitespace at line %s in text '%s'" % (token.lexer.lineno + 1, token.value[:-1])
          token.lexer.lexerror = True
          token.lexer.skip(1)
docs: ur'.+? \n