add a "not" search in the web_ui

[ampotos]

Searching in the web can be difficult. For example when looking for a block which is not of size X, the actual best way is to sort the blocks by size and look before and after the size X.

The idea here is to add a search for something which is not including the content of the search field.
Maybe when the ligne start with '!' do a not search is a good start for that issue.
A better thing can be to combinate a normal search and a not search. Something like everythin until the '!' is used for the normal search and everything after the '!' is used for the not search.

There is a suggestion to use regex here intead of the '!'.