Why should it move on if the match fails?

Is "(?(condition)yes-pattern)" an abbreviation for "(?(condition)yes-pattern|)" (i.e. with an explicitly empty no-pattern)? This seems most reasonable to me, but I find nothing in the documentation to suggest whether this or any other possibile behaviour should be expected.

The most fundamental "bug" seems to be lack of documentation of intended behaviour.

In reply to Re^3: A bug in regex with conditional subpattern? by ig
in thread A bug in regex with conditional subpattern? by Serge314

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