Eric Blake <[email protected]> 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).
