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[英]in python regular expression,why can't (h)* and (h)+ yield same result?
[英]Why can't my regular expression find the result?
数据是这样的:
post date='2008-7' postCount='8' viewCount='24308' questionCount='5' answerCount='76' answeredQuestion='5'
这是我的任务代码:
p1 = re.compile(r"post date")
m1 = p1.search(postline)
if m1:
month = re.search(r'post date="([\d\W]+)"', postline).group(1)
你正在寻找双qoutes "
而你的例子是单qoutes '
。
re.search(r'post date="([\d\W]+)"'
^ ^
。
post date='2008-7' postCount='8' viewCount='24308' questionCount='5' answerCount='76' answeredQuestion='5'
^ ^
编辑:问题不再是正则表达式,而是你的python。 这是一个例子:
import re
postline = "post date='2008-7' postCount='8' viewCount='24308' questionCount='5' answerCount='76' answeredQuestion='5'"
pattern = "post date='([\d\W]+)'"
p1 = re.compile(pattern)
date = p1.search(postline).group(1)
print date
输出:
2008-7
您的约会日期是否格式YYYY-M
? 如果是这样,相应地构建您的模式? 此模式允许YYYY-M
或YYYY-MM
:
>>> import re
>>> postline = "post date='2008-7' postCount='8' viewCount='24308' questionCount='5' answerCount='76' answeredQuestion='5'"
>>> pat = r"post date='(\d{4}-\d{1,2})'"
>>> re.search(pat, postline).group(1)
'2008-7'
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