/usr/share/aclocal-1.4/regex.m4 is in automake1.4 1:1.4-p6-13.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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## Check if --with-regex was given. ##
## --------------------------------- ##
# serial 1
# The idea is to distribute rx.[hc] and regex.[hc] together, for a while.
# The WITH_REGEX symbol (which should also be documented in acconfig.h)
# 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_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 $am_cv_gnu_regex = no; then
LIBOBJS="$LIBOBJS regex.o"
fi
else
AC_MSG_RESULT(rx)
AC_CHECK_FUNC(re_rx_search, , [LIBOBJS="$LIBOBJS rx.o"])
fi
AC_SUBST(LIBOBJS)dnl
])
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