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.
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.
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。
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