Understand the behaviour of Stdio.Buffer()->match()

[Marcus Comstedt (ACROSS) (Hail Ilpalazzo!) @ Pike (-) developers forum]

The behaviour of match() when there is not exactly one thing matching
seems a bit weird in general:

Pike v9.0 release 2 running Hilfe v3.5 (Incremental Pike Frontend)
> object buf = Stdio.Buffer("#4,7");
> buf->match("#%d,%d");
(1) Result: 11
>