(spec) Runtime.Version version string is ambiguous (JEP 223)

FULL PRODUCT VERSION :


A DESCRIPTION OF THE PROBLEM :
According to JEP 223, the version format is:
$VNUM(-$PRE)?(\+$BUILD)?(-$OPT)?

Both PRE and OPT are alphanumeric, with OPT additionally allowing periods.

Since PRE, BUILD, and OPT are all optional, there is no way to distinguish a version identifier with no PRE or BUILD and an OPT that does not contain a period, and one with a PRE but no BUILD or OPT.

In other words, if the version identifier is "9-something", "something" could either be a pre release identifier or optional information. I don't see anything in the specification that distinguishes these two possibilities.


REPRODUCIBILITY :
This bug can be reproduced always.