It is just a matter of specifying the expression grammar.
它只是指定了表达式语法而已。
This grammar states that a legal expression in this language consists of either.
该语法说明了该语言中的合法表达式包含。
A regular expression is similar (and in fact suffices for this particular grammar production).
正则表达式与此相似(并且事实上它能够满足这种特定语法产品的需要)。
A regular expression is similar (and in fact suffices for this particular grammar production).
正则表达式与此相似(并且事实上它能够满足这种特定语法产品的需要)。
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