Hello,

Should the following work, too?
A *  bold * word
In my opinion, for the filter to work, the bold markers should not be separated by spaces from the text, like:
A *bold* word

This reduces the misinterpretations of the filter (two bolds on the same row, http://jira.xwiki.org/jira/browse/XWIKI-333 ), eliminates the confusion between bold and lists:
* is this bold, * or is it a list with an asterisk?

The same for italics and underline.

The radeox filter rules can be easily changed, but the wysiwyg editor must put the filter markers not exactly at the selection start/end, but at the nearest character.