In regular expressions, a normal character is an atom that denotes the singleton set of strings containing only itself.
在正则表达式中,一个常规字符是一个原子,它表示只包含其自身的单字符串集。
In regular expressions, a normal character is an atom that denotes the singleton set of strings containing only itself.
在正则表达式中,一个常规字符是一个原子,它表示只包含其自身的单字符串集。
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