The strings that represent each of the special characters makes the code easier to read.
代表特殊字符的字符串使得代码看起来更清楚。
A regular expression is a pattern of characters that describes a set of strings.
正则表达式是描述一组字符串的字符模式。
A regular expression is a pattern of characters that describes a set of strings.
正则表达式是描述一组字符串的字符模式。
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