Python正则表达式：替换匹配中的单个字符

Question

I'm trying to substitute every individual character found in a regex match but I can't seem to make it work.

I have a string containing parenthesized expressions that have to be replaced.

For example, foo bar (baz) should become foo bar (***)

Here is what I came up with: re.sub(r"(\\(.*?).(.*?\\))", r"\\1*\\2", "foo bar (baz)") Unfortunately, I can't seem to apply the substitution to every character between the parentheses. Is there any way to make this work?

Answer 1

How about something like this?

>>> import re
>>> s = 'foo bar (baz)'
>>> re.sub(r'(?<=\().*?(?=\))', lambda m: '*'*len(m.group()), s)
'foo bar (***)'