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re.sub使用替换函数
re.sub(pattern, repl, string, count=0, flags=0 )
Use function as repl
>>> text = 'UPPER PYTHON, lower python, Mixed Python'
>>> re.findall('python', text, flags=re.IGNORECASE)
['PYTHON', 'python', 'Python']
>>> re.sub('python', 'snake', text, flags=re.IGNORECASE)
'UPPER snake, lower snake, Mixed snake'
function will receive a match object as input parameter
def replace(m):
word = 'snake'
text = m.group()
if text.isupper():
return word.upper()
elif text.islower():
return word.lower()
elif text[0].isupper():
return word.capitalize()
else:
return word
>>> re.sub('python', replace, text, flags=re.IGNORECASE)
'UPPER SNAKE, lower snake, Mixed Snake'
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