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Description of problem:

man semanage-fcontext

Contains "This command maps file paths using regular expressions to SELinux labels" - but it does not say what sort of regular expressions: eg POSIX, Perl, ... and any extensions/restrictions. The only example anywhere seems to be (/.*)? -- OK, not quite true but I look at this and feel very unsure as to what I can/cannot use.

It's PCRE, see https://github.com/SELinuxProject/selinux-notebook/blob/51a1d128d5112f5022f54994a9ab669c4c1f389d/src/policy_store_config_files.md#building-the-file-labeling-support-files adn https://github.com/SELinuxProject/selinux-notebook/blob/51a1d128d5112f5022f54994a9ab669c4c1f389d/src/policy_config_files.md#contextsfilesfile_contexts 

The man page should mention it as well. Thanks for the bug report.

Ah: PCRE - thanks.

What regular expression flags are in effect ? I assume that there is not a way of specifying them; the 'i' (case-insensitive) not being set.
Is 'u' (Unicode) set, eg will a.b match a£b ? Is this affected by $LANG ?

You might also mention that '/' is not a special character -- to clearly distance itself what happens in shell globbing.
Many will understand, but no harm in being nice to novices!

Thanks for picking this up.

https://lore.kernel.org/selinux/20210210170529.1395705-1-vmojzis@redhat.com/T/#u

Brilliant - questions answered, thanks.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (policycoreutils bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2021:1715