I want to write a 4chan X regex filter for posts ending in "do X really" where X is a variable. Should be simple, but AIs always get stumped by this. None of the following filters have worked for me:

> /do[A-Za-z0-9\s]* really(\?)?$/
> /do[^a-zA-Z0-9\n\r]*[a-zA-Z0-9]+ really(\?)?$/
> /.* do[^a-zA-Z0-9\s]*[a-zA-Z0-9]+ really(\?)?$/s
> /.* do[^a-zA-Z0-9\r\n\s]*[a-zA-Z0-9]+ really(\?)?$/s
> /.* do[^a-zA-Z0-9]*[a-zA-Z0-9]+ really(\?)?$/s
> /.* do[^a-zA-Z0-9\r\n]*[a-zA-Z0-9]+ really(\?)?$/s

Can anyone write a working regex for this?