char errbuf[1024];
                regerror(err, ®ex, errbuf, 1024);
                regfree(®ex);
-               die("invalid log-grep regex: %s", errbuf);
+               die("invalid regex: %s", errbuf);
        }
 
        pickaxe(&diff_queued_diff, o, ®ex, NULL, diff_grep);
                        char errbuf[1024];
                        regerror(err, ®ex, errbuf, 1024);
                        regfree(®ex);
-                       die("invalid pickaxe regex: %s", errbuf);
+                       die("invalid regex: %s", errbuf);
                }
                regexp = ®ex;
        } else {