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                            后面的表達式可以引用前面的某個分組，用`\1`表示，就好像分組1的值賦值給了`\1`這個變量，這個變量可以在后面任意位置引用。

*   `\1`?表示分組1匹配的文本
*   `\k`?表示分組`Word`匹配的文本

匹配重復兩個的英文，例如匹配`Hello Hello`、`lei123 lei123`：

1.  `(\w+)\s+\1`
2.  `(?\w+)\s+\k`
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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