List-all-occurrences negation

[jporkkahtc]

Much like we have keep-search and the opposite delete-search, an opposite of "List-all-occurrences" would be nice.
list each line that doesn't match.

See also "grep -v"

[Clark]

There's a command which almost does what you want. On the SlickEdit command line try "allnot /if".  This will hide all lines which contain "if".

I don't use the "allnot" command much but I often use the "all" command which does the opposite.