Optional match group with filterTags.pattern

[hobbsh]

Hi,

Is it possible to use an optional capture group for a filterTags.pattern?

Something like ^\d+\.\d+\.\d+(-\d+)?$, optionally matching the -0 on 1.0.0-0, which is technically valid semver. We currently have this configured and it seems to be ignoring the capture group, maybe because flux is expecting it to be used with extract?