regex re.compile，无法正常工作

Question

我尝试了以下内容：

title = 'Die.Simpsons.S02.German'
season = re.compile('.*S\d|\Sd{2}|eason\d|eason\d{2}.*')
test = season.match(title)
print test

但我总是收到＆＃39; none＆＃39;

Answer 1

根据您的变量名称，我假设您对季节编号感兴趣，而不是整个标题。如果我是对的，它应该是这样的：

title = 'Die.Simpsons.S02.German'

# This will match Die.Simpsons.S1, Die.Simpsons.S01, Die.Simpsons.Season1 etc ...
reg = re.compile('.*(S|Season|eason)(\d+)')

# get only the season number, group(0) gives full match, group(1) first '()' and so on
season = reg.match(title).group(2)

print season # prints '2'

您可以使用reg.match代替reg.search，而不需要在开头.*：

reg = re.compile('(S|Season|eason)(\d+)')
season = reg.search(title).group(2)

// EDIT 托马斯评论后修正

Answer 2

使用此代码可以：

import re

regex = r".*S(eason)?\d{1,2}.*"
test_str = "Die.Simpsons.S02.German"
matches = re.finditer(regex, test_str)

for matchNum, match in enumerate(matches):
    matchNum = matchNum + 1

    print ("Match {matchNum} was found : {match}".format(matchNum = matchNum, match = match.group()))

请参阅demo。