将正则表达式匹配替换为应用函数的结果

Question

I did something like that before in ruby:

text.gsub!( SOME REGEX ) do |s|
    s.SOME_STRING_STUFF
end

I know there is nothing like rubys "do" in python, but I can't figure out how to do something like that!

Answer 1

只需将函数作为替换传递给re.sub ：

print(re.sub(r't[^t].', lambda m: m.group(0)[::-1], 'testtext')) # settxett