RE: RE-ASSOC: a question about the associativity of RE concatenation

["Donn Terry" <yyyyyy@xxxxxxxxxxxxx>]

The critical piece of information that's missing here is that for
the most popular implementations (Spencer, "original UNIX", Linux,
come to mind but might not be the only choices) what actually happens
today.  (And historically, if things have changed.)

Given the "existing practice" decisions that were made during the last
revision (to the extent of backing out text that was in .2-1992 that
was intentionally and with full knowledge not compatible with existing
practice when it was written), it would be VERY hard to argue that 
anything but existing practice (if there's a consensus among the older
implementations, anyway) should be accepted.  (I suspect that the
subtleties
of existing practice match the grammars, but that's yet to be proven.)

Donn