new file mode 100644
--- /dev/null
+++ b/sub_filter_multi2.t
@@ -0,0 +1,82 @@
+#!/usr/bin/perl
+
+# (C) Dmitry Volyntsev
+# (C) Nginx, Inc.
+
+# Tests for sub filter with variables in search patterns.
+
+###############################################################################
+
+use warnings;
+use strict;
+
+use Test::More;
+
+BEGIN { use FindBin; chdir($FindBin::Bin); }
+
+use lib 'lib';
+use Test::Nginx;
+
+###############################################################################
+
+select STDERR; $| = 1;
+select STDOUT; $| = 1;
+
+my $t = Test::Nginx->new()->has(qw/http rewrite sub/)
+	->write_file_expand('nginx.conf', <<'EOF');
+
+%%TEST_GLOBALS%%
+
+daemon off;
+
+events {
+}
+
+http {
+    %%TEST_GLOBALS_HTTP%%
+
+    server {
+        listen       127.0.0.1:8080;
+        server_name  localhost;
+
+        sub_filter_types *;
+
+        location /var/replacement {
+            sub_filter_once off;
+            sub_filter '${arg_a}' '${arg_a}+';
+            sub_filter '${arg_b}' '${arg_b}-';
+            return 200 $arg_c;
+        }
+
+        location /var/replacement2 {
+            sub_filter_once off;
+            sub_filter '${arg_a}A${arg_b}'  +;
+            sub_filter '${arg_c}AA${arg_d}' -;
+            return 200 $arg_e;
+        }
+    }
+
+}
+
+EOF
+
+$t->try_run('no multiple sub_filter')->plan(7);
+
+###############################################################################
+
+like(http_get('/var/replacement?a=a&b=b&c=abXYaXbZ'),
+	qr/a\+b-XYa\+Xb-Z/, 'complex');
+like(http_get('/var/replacement?a=patt&b=abyz&c=pattabyzXYpattXabyzZpatt'),
+	qr/patt\+abyz-XYpatt\+Xabyz-Zpatt\+/, 'complex 2');
+like(http_get('/var/replacement?a=a&b=b&c=ABXYAXBZ'),
+	qr/a\+b-XYa\+Xb-Z/, 'case insensivity');
+like(http_get('/var/replacement?b=b&c=abXYaXbZ'),
+	qr/ab-XYaXb-Z/, 'one search string is empty');
+like(http_get('/var/replacement?c=abXYaXbZ'),
+	qr/abXYaXbZ/, 'all search strings are empty');
+like(http_get('/var/replacement2?a=aaa&b=bbb&c=yy&d=zz&e=AaaaAbbbZyyAAzzY'),
+	qr/A\+Z-Y/, 'multiple variables');
+like(http_get('/var/replacement2?b=bbb&c=yy&e=AAbbbZyyAAY'),
+	qr/A\+Z-Y/, 'multiple variables 2');
+
+###############################################################################