Problem
WYSIWYG Should support 100% what we are seeing, since this is actually "what you see is what you get" this should be addressed as a bug.
Example Perl regEx::
(.*)_(.*)
When to obtain the code above you have to use:
(.\*)_(.\*)
Cannot be used even if you escape the characters, because once you save it, it loses the escape and renders poorly once it has been resaved.
Fix
None Yet
Workaround
Unfortunately to use {code}