*`v([0-9]+)\.([0-9]+)\.([0-9]+)` has 3 (unnamed) capturing groups, each capturing any number of digits
*`v(P<major>[0-9]+)\.(P<minor>[0-9]+)\.(P<patch>[0-9]+)` has 3 **named** capturing groups (_major_, _minor_ and _patch_), each capturing any number of digits
*`v(?<major>[0-9]+)\.(?<minor>[0-9]+)\.(?<patch>[0-9]+)` has 3 **named** capturing groups (_major_, _minor_ and _patch_), each capturing any number of digits
*`$DOCKER_RELEASE_EXTRA_TAGS` supports capturing group references from `$DOCKER_RELEASE_EXTRA_TAGS_PATTERN`:
*`\g1` is a reference to capturing group number 1
*`\g<major>` is a reference to capturing group named _major_
