(jm_INCLUDED_REGEX): Use a quadrigraph to represent an

unmatched right bracket, rather than an extra, falsely-matching
quote in a comment.  Patch by Akim Demaille.

1 files changed, 2 insertions, 5 deletions

diff --git a/m4/regex.m4 b/m4/regex.m4
index a79f03bcd7..0eb69fc74a 100644
--- a/m4/regex.m4
+++ b/m4/regex.m4
@@ -1,4 +1,4 @@
-#serial 10
+#serial 11
 
 dnl Initially derived from code in GNU grep.
 dnl Mostly written by Jim Meyering.
@@ -30,10 +30,7 @@ AC_DEFUN(jm_INCLUDED_REGEX,
 	    const char *s;
 	    struct re_registers regs;
 	    re_set_syntax (RE_SYNTAX_POSIX_EGREP);
-	    /* 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.  */
+	    [s = re_compile_pattern ("a[[:@:>@:]]b\n", 9, &regex);]
 	    /* This should fail with _Invalid character class name_ error.  */
 	    if (!s)
 	      exit (1);