/usr/share/aclocal-1.11/regex.m4 is in automake 1:1.11.3-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 | ## --------------------------------- ## -*- Autoconf -*-
## Check if --with-regex was given. ##
## --------------------------------- ##
# Copyright (C) 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
# 2010, 2011 Free Software Foundation, Inc.
#
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.
# serial 10
# AM_WITH_REGEX
# -------------
#
# THIS MACRO IS OBSOLETE now, since rx doesn't seem to be maintained,
# while regex is. This macro should be removed in the next major
# automake version (1.12).
#
# The idea is to distribute rx.[hc] and regex.[hc] together, for a
# while. The WITH_REGEX symbol is used to decide which of regex.h or
# rx.h should be included in the application. If `./configure
# --with-regex' is given (the default), the package will use gawk's
# regex. If `./configure --without-regex', a check is made to see if
# rx is already installed, as with newer Linux'es. If not found, the
# package will use the rx from the distribution. If found, the
# package will use the system's rx which, on Linux at least, will
# result in a smaller executable file.
#
AC_DEFUN([AM_WITH_REGEX],
[AC_PREREQ(2.50)dnl
m4_warn([obsolete], [$0 is obsolete, since GNU rx is unmantained now])dnl
AC_LIBSOURCES([rx.h, rx.c, regex.c, regex.h])dnl
AC_MSG_CHECKING([which of GNU rx or gawk's regex is wanted])
AC_ARG_WITH([regex],
[ --without-regex use GNU rx in lieu of gawk's regex for matching],
[test "$withval" = yes && am_with_regex=1],
[am_with_regex=1])
if test -n "$am_with_regex"; then
AC_MSG_RESULT([regex])
AC_DEFINE([WITH_REGEX], 1, [Define if using GNU regex])
AC_CACHE_CHECK([for GNU regex in libc], [am_cv_gnu_regex],
[AC_TRY_LINK([],
[extern int re_max_failures; re_max_failures = 1],
[am_cv_gnu_regex=yes],
[am_cv_gnu_regex=no])])
if test $am_cv_gnu_regex = no; then
AC_LIBOBJ([regex])
fi
else
AC_MSG_RESULT([rx])
AC_CHECK_FUNC([re_rx_search], , [AC_LIBOBJ([rx])])
fi[]dnl
])
AU_DEFUN([fp_WITH_REGEX], [AM_WITH_REGEX])
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