I got the solution but didn't understand it for the beginner "naughty" puzzle ... http://regexcrossword.com/challenges/beginner/puzzles/2 http://regexcrossword.

I got the solution but didn't understand it for the beginner "naughty" puzzle ... http://regexcrossword.com/challenges/beginner/puzzles/2 http://regexcrossword.com/challenges/beginner/puzzles/2