If you discover or invent some slightly new variant of the language, it is a lot easier to play with the EBNF grammar than with those regular expressions.
Spellings vary slightly, but the general notions of quantification, alternation, and sequencing exist in all EBNF-style language grammars.
尽管如此，还是有很多读者推荐说用于PythonDParaser值得关注，虽然我更喜欢单独的EBNF定义。
After transforms them the EBNF grammars and unambiguous SINS charts, we may write the corresponding procedure according to every chart.
拼写稍有不同，但是量化、交替和定序这些一般概念都存在于所有EBNF样式的语言语法中。
