Python regex group（）可以工作，但是findall（）的結果與我預期的不一樣

Question

我正在解析一些日志，並想提取某種類型的所有參數名稱。 為了簡單起見，我將只包含一個小的子字符串。

log = 'WT.tz=-8&WT.bh=23&WT.ul=en-US'

#I want to find all strings that start with WT and get WT and all the following characters until I find an & or the end of the string. I tested this on an online regex page and it seems to work great.
regex = r'(?s)(?=WT).+?(?=(=))'

# if I try to find the first I get what I expected
re.search(regex,log).group()
>> 'WT.tz'

#when I try to find all I do not get what I thought I was going to get.
re.findall(regex,log)
>> ['=','=','=']

Answer 1

findall返回所有groups 。您有一個組(=) 。因此將其刪除。

regex = r'(?s)WT.+?(?==)'

                   ^^^^^

同樣也不需要lookahead 。

輸出： ['WT.tz', 'WT.bh', 'WT.ul']

Answer 2

log = 'WT.tz=-8&WT.bh=23&WT.ul=en-US'

print(re.findall(r'WT\.[^&]*\b',log))

['WT.tz=-8', 'WT.bh=23', 'WT.ul=en-US']