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                            |  字符   |   功能  |
| --- | --- |
|   \|  |  左右任意一個表達式   |
|   (ab)  | 將括號中字符作為一個分組 |
|  \num   |  引用分組num匹配到的字符串   |
|  (?P\<name\>)  |  分組起別名   |
|   (?P=name)  |  引用別名為name分組匹配到的字符串   |

示例
~~~
import re

# |
#匹配0到100的數字
ret = re.match('[1-9]?\d$|100', '66')
print(ret.group())

# ()
#匹配163, 126, qq郵箱
ret = re.match('\w{4,20}@(163|qq|126)\.com', '12345@163.com')
print(ret.group())

#不以4和7結尾的手機號
ret = re.match('1\d{9}[0-36-68-9]', '18512345678')
print(ret.group())

~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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