如何在python中替換大小寫字符串，目標字符串在？

我知道如何替換python中的字符串，但我只想在目標字符串周圍添加一些標記，而目標字符串是caseinsentive。有什麼簡單的方法可以使用嗎？例如，我想添加支架周圍的一些話，如：如何在python中替換大小寫字符串，目標字符串在？

"I have apple." -> "I have (apple)." 
"I have Apple." -> "I have (Apple)." 
"I have APPLE." -> "I have (APPLE)."

來源

2017-04-15 maple

見'IGNORECASE'標誌。 https://docs.python.org/2/howto/regex.html#compilation-flags –

您必須匹配不區分大小寫。您可以在模式中包含的標誌，如：

import re 

variants = ["I have apple.", "I have Apple.", "I have APPLE and aPpLe."] 

def replace_apple_insensitive(s): 
    # Adding (?i) makes the matching case-insensitive 
    return re.sub(r'(?i)(apple)', r'(\1)', s) 

for s in variants: 
    print(s, '-->', replace_apple_insensitive(s)) 

# I have apple. --> I have (apple). 
# I have Apple. --> I have (Apple). 
# I have APPLE and aPpLe. --> I have (APPLE) and (aPpLe).

或者你可以編譯正則表達式，並保持不區分大小寫的標誌出的格局：

apple_regex = re.compile(r'(apple)', flags=re.IGNORECASE) # or re.I 
print(apple_regex.sub(r'(\1)', variants[2])) 

#I have (APPLE) and (aPpLe).

來源

2017-04-15 10:15:53

如何在python中替換大小寫字符串，目標字符串在？

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