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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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