Feature request: Negative/extended search in log dialog

Recently, I wanted to display all log messages _not_ containing
specific substring.
Sure, it is not very frequent thing to want but still I think it is
worth thinking of.

User interface can be implemented in the following ways:
1) A dedicated checkbox 'Negate search'.
Advantages: simplest to implement.
Disadvantages: clutters UI.

2) Special character to denote negation, e.g. "!search string".
Advantages: simple to implement, not visual clutter.
Disadvantages: hard do discover for users, needs way to escape
negation character.

3) Implement full regex support for searching.
Advantages: most powerful and simple from the users' POV.
Disadvantages: Obviously more complex to implement.

I think this is somehow related to task #326, although from reading
task text I did not fully understood that it is about.

-- 
Alexander S. Klenin
Insight Experts Ltd.
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