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| 字符   |  功能  |
| --- | --- |
| *   |  匹配前一個字符出現0次或者無限次,即可有可無  |
| +   | 匹配前一個字符出現1次或者無限次,即至少有一次   |
|   ? |  匹配前一個字符出現1次或者0次,即要么有1次,要么沒有  |
| {m}   | 匹配前一個字符出現m次   |
|  {m,}  | 匹配前一個字符至少出現了m次   |
| {m,n}   | 匹配前一個字符出現了m到n次   |


~~~
# * 表示前一個字符出現0次或者無限次
re.match("\d*", "a")
<_sre.SRE_Match object; span=(0, 0), match=''>
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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