===================================================================
RCS file: /cvs/mandoc/mansearch.c,v
retrieving revision 1.76
retrieving revision 1.78
diff -u -p -r1.76 -r1.78
--- mandoc/mansearch.c	2017/08/02 13:29:04	1.76
+++ mandoc/mansearch.c	2018/11/19 19:27:37	1.78
@@ -1,7 +1,7 @@
-/*	$Id: mansearch.c,v 1.76 2017/08/02 13:29:04 schwarze Exp $ */
+/*	$Id: mansearch.c,v 1.78 2018/11/19 19:27:37 schwarze Exp $ */
 /*
  * Copyright (c) 2012 Kristaps Dzonsons <kristaps@bsd.lv>
- * Copyright (c) 2013-2017 Ingo Schwarze <schwarze@openbsd.org>
+ * Copyright (c) 2013-2018 Ingo Schwarze <schwarze@openbsd.org>
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -188,6 +188,16 @@ mansearch(const struct mansearch *search,
 			mpage = *res + cur;
 			mandoc_asprintf(&mpage->file, "%s/%s",
 			    paths->paths[i], page->file + 1);
+			if (access(chdir_status ? page->file + 1 :
+			    mpage->file, R_OK) == -1) {
+				warn("%s", mpage->file);
+				warnx("outdated mandoc.db contains "
+				    "bogus %s entry, run makewhatis %s", 
+				    page->file + 1, paths->paths[i]);
+				free(mpage->file);
+				free(rp);
+				continue;
+			}
 			mpage->names = buildnames(page);
 			mpage->output = buildoutput(outkey, page);
 			mpage->ipath = i;
@@ -764,8 +774,9 @@ exprterm(const struct mansearch *search, int argc, cha
 		cs = 0;
 	} else if ((val = strpbrk(argv[*argi], "=~")) == NULL) {
 		e->bits = TYPE_Nm | TYPE_Nd;
-		e->match.type = DBM_SUB;
-		e->match.str = argv[*argi];
+		e->match.type = DBM_REGEX;
+		val = argv[*argi];
+		cs = 0;
 	} else {
 		if (val == argv[*argi])
 			e->bits = TYPE_Nm | TYPE_Nd;