currently regexp filtering for lld rules only allows to filter on a single POSIX regexp for a single macro. this has several limitations, thus several things would be desired (may be split out in separate issues).
a) ability to add multiple filters. for example, one to filter on fsname and exclude some custom filsesystem, one to filter on fstype.
b) ability to negate strings. one way might be to allow specifying "not" for individual filter rules (depends on a) ), another might be to support PCRE or similar everywhere in server, thus allowing regexp lookarounds