===================================================================
RCS file: /cvs/mandoc/regress/roff/cond/string.in,v
retrieving revision 1.2
retrieving revision 1.5
diff -u -p -r1.2 -r1.5
--- mandoc/regress/roff/cond/string.in	2017/06/18 17:36:06	1.2
+++ mandoc/regress/roff/cond/string.in	2022/06/03 12:15:57	1.5
@@ -1,4 +1,5 @@
-.TH STRING 1 "June 14, 2017" OpenBSD
+.\" $OpenBSD: string.in,v 1.5 2022/06/03 12:15:57 schwarze Exp $
+.TH STRING 1 "June 3, 2022"
 .SH NAME
 string \- conditional testing whether a string is defined
 .SH DESCRIPTION
@@ -31,3 +32,36 @@ mymacval
 standard macro is
 .ie d PP defined
 .el not defined \(em OOPS
+.PP
+identifier and tab:
+.ie d mystr	mystr is defined
+.el OOPS
+.PP
+escape sequence after identifier:
+.ie d mystr\(enmystr is defined
+.el OOPS
+.PP
+backslash in name:
+.ds \\ value
+.ie d \\ \e is defined
+.el OOPS
+.rm \\
+.if d \\ still defined!?
+.PP
+dot in name:
+.ds . value
+.ie d . \&. is defined
+.el OOPS
+.ie d \. \e. is defined
+.el OOPS
+.rm .
+.if d . still defined!?
+.PP
+invalid escape in name:
+.ds G value
+.ie d G G is defined
+.el OOPS
+.ie d \G \eG is defined
+.el OOPS
+.rm \G
+.if d G still defined!?