X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fregex.m4;h=f546dd7bcdc5ae6e98fc0c918acea197fdcb4f21;hb=180c9fa195e6171ed0703e58087603628b3c14e1;hp=66b39c3aea339fd672c3477d18aae664e32b1aa9;hpb=1101c119db205fd986144867cde7545ef52460a7;p=gnulib.git

diff --git a/m4/regex.m4 b/m4/regex.m4
index 66b39c3ae..f546dd7bc 100644
--- a/m4/regex.m4
+++ b/m4/regex.m4
@@ -30,9 +30,10 @@ AC_DEFUN(jm_INCLUDED_REGEX,
 	    const char *s;
 	    struct re_registers regs;
 	    re_set_syntax (RE_SYNTAX_POSIX_EGREP);
-	    /* Add this third left square bracket, [, to balance the
-	       three right ones below.  Otherwise autoconf-2.14 chokes.  */
+	    /* These two brackets, `[[' and the one in the comment below serve
+	       to quote the brackets (unbalanced) in the following line.  */
 	    s = re_compile_pattern ("a[[:]:]]b\n", 9, &regex);
+	    /* This bracket `]' helps quote the unbalanced expression above.  */
 	    /* This should fail with _Invalid character class name_ error.  */
 	    if (!s)
 	      exit (1);