regex are documented in re_format.7, not the C API in regex.3

games/fortune/fortune/fortune.6

@@ -1,4 +1,4 @@
-.\"	$OpenBSD: fortune.6,v 1.12 2010/02/21 10:38:08 jmc Exp $
+.\"	$OpenBSD: fortune.6,v 1.13 2015/02/06 09:30:04 tedu Exp $
 .\"
 .\" Copyright (c) 1985, 1991, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -32,7 +32,7 @@
 .\"
 .\"	@(#)fortune.6	8.3 (Berkeley) 4/19/94
 .\"
-.Dd $Mdocdate: February 21 2010 $
+.Dd $Mdocdate: February 6 2015 $
 .Dt FORTUNE 6
 .Os
 .Sh NAME
@@ -78,7 +78,7 @@ Long dictums only.
 Print out all fortunes which match the regular expression
 .Ar pattern .
 See
-.Xr regex 3
+.Xr re_format 7
 for a description of patterns.
 .It Fl o
 Choose only from potentially offensive aphorisms.
@@ -178,6 +178,6 @@ if it exists.
 Fortune files.
 .El
 .Sh SEE ALSO
-.Xr regex 3 ,
 .Xr random 6 ,
-.Xr rot13 6
+.Xr rot13 6 ,
+.Xr re_format 7