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|*|匹配>=0个重复的在*号之前的字符。|
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|+|匹配>=1个重复的+号前的字符。
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|?|标记?之前的字符为可选.|
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|{n,m}|匹配num个大括号之前的字符 (n <= num <= m).|
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|{n,m}|匹配num个大括号之间的字符 (n <= num <= m).|
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|(xyz)|字符集,匹配与 xyz 完全相等的字符串.|
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|||或运算符,匹配符号前或后的字符.|
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|\|转义字符,用于匹配一些保留的字符 <code>[ ] ( ) { } . * + ? ^ $ \ |</code>|
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