正則表達式re.compile，無法得到它的工作

Question

我試過如下：

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

，但我總是得到 '沒有'

Answer 1

根據您的變量名稱，我假設您對季節編號感興趣，而不是整個標題。如果我是正確的，應該是這樣的：

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' 

相反的reg.match你也可以使用reg.search，那麼你就需要有.*開頭：

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

// EDIT 托馬斯評論後修復

Answer 2

使用此代碼的工作：

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())) 

見demo。