|What can I do if my regex does not detect a keyword in FKM as I expect?
The default Regex type for FKM is POSIX Extended. There are cases when these do not match patterns as expected. In most cases it is advisable to enable the Use PCRE Perl Compatible Regex via FKM -> Advanced tab.
Using the Plugin's PCRE Compatible Regex option results in matches working as expected by the majority of users. The default POSIX Extended format doesn't support common escape sequences such a \s for white space, instead relying on character classes in bracket expressions like [:space:]