Regular expression for this?

What is the regular expression to get a format of (\S+ \S+) which add together no more then 25 characters?

If I understand correctly, you want to match on two 'words' of non-whitespace characters, separated by a single space, whose total length is <= 25 characters (including the space).

This is doable in a single regular expression, but not easily. You could do something like:

regex= r'(\S \S{1,23})|(\S{2} \S{1,22})|(\S{3} \S{1,21})|...|(\S{23} \S)'

Where '...' in the above needs to be filled with all the intermediate combinations.

but this would be very cumbersome and probably highly inefficient.

I think it would be better to match on r'\S+ \S+' and then filter out the matches that are too long.

Dave - The Developers' Coach

This is the correct way of doing it.

That's the sanest thing I've heard about regexes in a long while.