Index: regress/usr.bin/grep/Makefile
===================================================================
RCS file: /home/cvs/src/regress/usr.bin/grep/Makefile,v
retrieving revision 1.17
diff -u -p -u -p -r1.17 Makefile
--- regress/usr.bin/grep/Makefile	12 Dec 2012 15:11:25 -0000	1.17
+++ regress/usr.bin/grep/Makefile	26 Dec 2021 10:15:02 -0000
@@ -1,7 +1,7 @@
 # $OpenBSD: Makefile,v 1.17 2012/12/12 15:11:25 weerd Exp $
 
 REGRESS_TARGETS=t1 t2 t3 t4 t5 t6 t7 t8 t9 t10 t11 t12 t13 t14 t15 t16 t17 \
-	t18 t19 t20 t21 t22 t23 t24 t25 t26
+	t18 t19 t20 t21 t22 t23 t24 t25 t26 t27
 
 t1:
 	grep t.s ${.CURDIR}/in | diff - ${.CURDIR}/t1.out
@@ -102,8 +102,13 @@ t25:
 t26:
 	echo 'aaab' | grep -o 'a*' | head -n 10 | diff - ${.CURDIR}/t26.out
 
+t27:
+	grep -A1 'C' ${.CURDIR}/t27.in | diff - ${.CURDIR}/t27a.out
+	grep -B1 'C' ${.CURDIR}/t27.in | diff - ${.CURDIR}/t27b.out
+	grep -C1 'C' ${.CURDIR}/t27.in | diff - ${.CURDIR}/t27c.out
+
 
 .PHONY: t1 t2 t3 t4 t5 t6 t7 t8 t9 t10 t11 t12 t13 t14 t15 t16 t17 t18 t19 t20
-.PHONY: t21 t22 t23 t24 t25 t26
+.PHONY: t21 t22 t23 t24 t25 t26 t27
 
 .include <bsd.regress.mk>
Index: regress/usr.bin/grep/t27.in
===================================================================
RCS file: regress/usr.bin/grep/t27.in
diff -N regress/usr.bin/grep/t27.in
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ regress/usr.bin/grep/t27.in	26 Dec 2021 10:32:02 -0000
@@ -0,0 +1,12 @@
+A
+B
+C
+D
+A
+B
+C
+D
+A
+B
+C
+D
Index: regress/usr.bin/grep/t27a.out
===================================================================
RCS file: regress/usr.bin/grep/t27a.out
diff -N regress/usr.bin/grep/t27a.out
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ regress/usr.bin/grep/t27a.out	26 Dec 2021 10:07:48 -0000
@@ -0,0 +1,8 @@
+C
+D
+--
+C
+D
+--
+C
+D
Index: regress/usr.bin/grep/t27b.out
===================================================================
RCS file: regress/usr.bin/grep/t27b.out
diff -N regress/usr.bin/grep/t27b.out
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ regress/usr.bin/grep/t27b.out	26 Dec 2021 10:10:21 -0000
@@ -0,0 +1,8 @@
+B
+C
+--
+B
+C
+--
+B
+C
Index: regress/usr.bin/grep/t27c.out
===================================================================
RCS file: regress/usr.bin/grep/t27c.out
diff -N regress/usr.bin/grep/t27c.out
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ regress/usr.bin/grep/t27c.out	26 Dec 2021 10:07:48 -0000
@@ -0,0 +1,11 @@
+B
+C
+D
+--
+B
+C
+D
+--
+B
+C
+D