它们是简单但功能强大的泛化正则表达式，比起传统的LALR或者LR-1语法的解析器生成器来说更易于使用。
They are a simple but powerful generalization of regular expressions that are easier to work with than the LALR or LR-1 grammars of traditional parser generators.
如果您发现或发明了该语言的某种经过微小更新的变体，将它和ebnf语法一起使用要比和那些正则表达式一起使用简单得多。
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.
SQL VALUES 表达式的语法相当简单，如 清单 6 所示。
The syntax for the SQL VALUES expression is fairly simple, as shown in Listing 6.
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