Re: [bug #37737] Contained subexpressions don't follow POSIX

[Роман Донченко]

Eric Blake <address@hidden> писал в своём письме Thu, 15 Nov 2012  
02:11:57 +0400:

> For reference, on Cygwin (where m4 uses gnulib's regex engine, rather
> than glibc's) I get correct behavior:
>
> $ printf %s 'regexp(abab, \(a\(b\)*\)*\2, \&-\1-\2)' | m4
> -1

That's interesting, because I don't:

$ uname -sr
CYGWIN_NT-6.1-WOW64 1.7.17(0.262/5/3)

$ m4 --version
m4 (GNU M4) 1.4.16
Packaged by Cygwin (1.4.16-1)
(etc, etc)

$ printf %s 'regexp(abab, \(a\(b\)*\)*\2, \&-\1-\2)' | m4
abab-a-b

In fact, Cygwin was where I did the test in the OP (although I've  
previously observed the bug on Linux, too).