RFE: support POSIX standard and developing RE's

Posix, has 2 official RE's already, the modern REs( like in
grep -E, (extended RE's)
and "obsolete RE's" as found in ed, called "basic REs".

Additionally for the past few years, more gnu utils (like grep -P)
have started supporting a third type of RE's called
PCRE [Perl Compatible RE's] that seem to be on their way
to becoming a 3rd official type of RE.

Would it be possible to add the 3 RE's (w/appropriate flags)
to invoke those standardized expressions (not as a replacement
for any of the existing RE's), but w/different flags.

This would allow those who know the posix-compat RE's that
are becoming more wide spread in usage, and would allow for
easier, direct usage (cut&paste) of the alternate RE's specifically
to make it easer to define these expressions in shell-vars and/or
vim-macros to allow for easier portability and usability between
vim and other posix & gnu utils? Note in the past few years,
the pcreRE's have also added python-specific features to the
syntax to allow for easier porting of python features.

Probably (or maybe) best of all, as all of these RE's are
becoming more prevalent in posix, unix and linux environments,
it would be a great benefit for people to be able to switch
to alternate RE's based on familiarity and and the greater
uniformity in these classes.

Seems this would lower the learning curve for RE usage in
vim where it often, idiosyncratically differs from such,
requiring much trial and error and wasted time to get
equivalent vim-compat-RE's that are equivalent to other
industry standard RE's.

Anyway, thought I'd mention this, since vim already has
multiple incompatible RE's with existing standards and
thought that providing a few "new POSIX-compat RE's" would
only help in making vim easier to use.

Thanks for your time!
-linda


Of course,

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