[Regex] Apache / proxy / mod_rewrite

HEllo,

I would like to write a regex for mod_rewrite in order to replace all
"?" by "!".
Do you think it's possible ?

I need this because i've got a lot of problems with Apache + proxy +
rewrite + ssl when my target server is Domino. The main point is that
the POST are truncated. I've read in a o'reilly book that i can have
problems with post when there is a "question-mark" in the URL.

Thanks,
AT/