fix BRE \0 test case

diff --git a/src/regression/regex-backref-0.c b/src/regression/regex-backref-0.c
index c5f20b5..289be3b 100644 (file)
--- a/src/regression/regex-backref-0.c
+++ b/src/regression/regex-backref-0.c
@@ -1,4 +1,5 @@
-// \0 is not a valid backref
+// \0 is not a valid backref, it is undefined by the standard
+// we treat such cases as literal char
 #include <regex.h>
 #include "test.h"
 
@@ -10,10 +11,15 @@ int main(void)
        int n;
 
        n = regcomp(&r, pat, 0);
-       // standard allows REG_BADPAT for all pattern errors
-       if (n != REG_ESUBREG && n != REG_BADPAT) {
+       if (n) {
                regerror(n, &r, buf, sizeof buf);
-               t_error("regcomp(%s) returned %d (%s) wanted REG_ESUBREG\n", pat, n, buf);
+               t_error("regcomp(%s) returned %d (%s) wanted 0\n", pat, n, buf);
+       }
+       n = regexec(&r, "a0", 0, 0, 0);
+       if (n) {
+               regerror(n, &r, buf, sizeof buf);
+               t_error("regexec(/%s/ ~ \"a0\") returned %d (%s), wanted 0\n",
+                       pat, n, buf);
        }
 
        return t_status;