On 27 April 2016, Linda W <vim@tlinx.org> wrote:
[...]
> BRE's are compatible with ERE's. If you *only* use BRE syntax, then
> any prog using ERE's "should" still work the same for you.
Right, I suppose I should have stopped reading here. :) I didn't
(against my better), presumably because:
[...]
> And you are an aggressive nerdbutt!
Thank you for noticing. It might be wise to keep that in mind for
the purpose of further interactions. :)
On 27 April 2016, Linda W <vim@tlinx.org> wrote:
> LCD 47 wrote:
[...]
> > Actually, try something simpler:
> >
> > $ grep --version
> > grep (GNU grep) 2.24
> > Copyright (C) 2016 Free Software Foundation, Inc.
> > License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
> > This is free software: you are free to change and redistribute it.
> > There is NO WARRANTY, to the extent permitted by law.
> >
> > Written by Mike Haertel and others, see <http://git.sv.gnu.org/cgit/grep.git/tree/AUTHORS>.
> >
> > $ echo 'foo bar' | egrep -o '[[:<:]]bar'
> > grep: Invalid character class name
> >
> What is [[:<:]]? What standard is it a part of? Never seen it before.
> Um:
> perl -we 'use strict; use P;
> > my $a="now < there";
> > $a =~ /[[:<:]] there/;
> > '
> POSIX class [:<:] unknown in regex; marked by <-- HERE in m/[[:<:] <--
> HERE ] there/ at -e line 3.
> ----
> Oh, You made up your own syntax!
I didn't, honestly. I didn't have to either, BSD came up with it
first:
http://man.openbsd.org/re_format.7
https://www.freebsd.org/cgi/man.cgi?query=re_format&sektion=7
http://netbsd.gw.com/cgi-bin/man-cgi?re_format+7+NetBSD-current
> I see. It's not part of any standard.
I could have sworn it was part of POSIX.1, and OpenBSD's
re_format(7) also seemed to imply that it is:
http://man.openbsd.org/re_format.7
Other people seem to believe the same:
http://www.regular-expressions.info/refwordboundaries.html
But I couldn't confirm that with the standard:
http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap09.html
-- and NetBSD's re_format(7) actually notes that [:<:] and [:>:] are
extensions:
http://netbsd.gw.com/cgi-bin/man-cgi?re_format+7+NetBSD-current
So you're right, it isn't part of POSIX. My bad, I should have
digged deeper, sorry about that. Regardless, It might still make a
worthy crussade for you BRE slayers to fight: unification of grep(1)
syntax across the various UNIX platforms. Then turn to sed(1) next.
They are in even wider used than Vim. :)
[...]
> > As for Vim: its regexes have features not present in any other
> > language.
> Such as?
[...]
An example that comes to mind is \ze.
The other end of this ship seems to have sailed some two weeks ago,
so I won't waste your time with re-hashing old arguments.
/lcd
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