python贪婪匹配以及多行匹配的实例讲解
1非贪婪flag
>>>re.findall(r"a(\d+?)","a23b") ['2'] >>>re.findall(r"a(\d+)","a23b") ['23']
注意比较这种情况:
>>>re.findall(r"a(\d+)b","a23b") ['23'] >>>re.findall(r"a(\d+?)b","a23b") ['23']
2如果你要多行匹配,那么加上re.S和re.M标志
re.S:.将会匹配换行符,默认.不会匹配换行符
>>>re.findall(r"a(\d+)b.+a(\d+)b","a23b\na34b") [] >>>re.findall(r"a(\d+)b.+a(\d+)b","a23b\na34b",re.S) [('23','34')] >>>
re.M:^$标志将会匹配每一行,默认^和$只会匹配第一行
>>>re.findall(r"^a(\d+)b","a23b\na34b") ['23'] >>>re.findall(r"^a(\d+)b","a23b\na34b",re.M) ['23','34']
但是,如果没有^标志,
>>>re.findall(r"a(\d+)b","a23b\na23b") ['23','23']
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