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                            表示不屬于元字符或者字符類的字符

**反義元字符**

*   `\W`?匹配任意不是字母，數字，下劃線，漢字的字符
*   `\S`?匹配任意不是空白符的字符
*   `\D`?匹配任意非數字的字符
*   `\B`?匹配不是單詞開頭或結束的位置

**反義字符類**

*   `[^x]`?匹配除了x以外的任意字符
*   `[^aeiou]`?匹配除了aeiou這幾個字母以外的任意字符
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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