care to expand on how the feature should work or detail what you mean by a 'not contain' filter for when reporting issues?

i.e.
Filter: apples (contain)
Filter "NOT": pineapples (not contain)

I want to list all issues with text apples, but not the issues with text pineapples.

Regards.
Leandro.

I wonder if somebody is following this issue.

This was already fixed by John in 0004843 (for versions 1.2.x and 1.3.x of MantisBT). Please see the commit message at http://git.mantisbt.org/?p=mantisbt.git;a=commit;h=60a4d24a794a81e98dc044ce42a9e4b8fa754111 for more information on the search syntax (essentially, you just prefix a search term with a negative sign).

So a search for "apple -peach" will find all issues containing "apple" but not "peach".