diff --git a/old-tests/filters/pfilter_t.c b/old-tests/filters/pfilter_t.c
index d03e4f8a4..8e87f657b 100644
--- a/old-tests/filters/pfilter_t.c
+++ b/old-tests/filters/pfilter_t.c
@@ -7,6 +7,8 @@
 #include "filter-persistent.h"
 #include "log.h"
 #include "dbg_malloc.h"
+#include "config.h"
+#include "filter-regex.h"
 
 #include <stdio.h>
 #include <ctype.h>
@@ -19,12 +21,15 @@
 
 int main(int argc, char **argv)
 {
-	struct dev_filter *filter;
+	struct config_file *cf;
+	struct config_node *cn;
+	struct dev_filter *rfilter, *pfilter;
 	struct dev_iter *iter;
 	struct device *dev;
 
-	if (argc > 2) {
-		fprintf(stderr, "Usage : %s <file>\n", argv[0]);
+	if (argc < 2) {
+		fprintf(stderr, "Usage : %s <regex config>\n",
+			argv[0]);
 		exit(1);
 	}
 
@@ -41,12 +46,54 @@ int main(int argc, char **argv)
 		exit(1);
 	}
 
-	if (!(filter = persistent_filter_create("./pfilter.cfg", 1))) {
+	if (!(cf = create_config_file())) {
+		fprintf(stderr, "couldn't create config file\n");
+		exit(1);
+	}
+
+	if (!read_config(cf, argv[1])) {
+		fprintf(stderr, "couldn't read config file\n");
+		exit(1);
+	}
+
+	if (!(cn = find_config_node(cf->root, "/devices/filter", '/'))) {
+		fprintf(stderr, "couldn't find filter section\n");
+		exit(1);
+	}
+
+	if (!(rfilter = regex_filter_create(cn->v))) {
 		fprintf(stderr, "couldn't build filter\n");
 		exit(1);
 	}
 
-	if (!(iter = dev_iter_create(filter))) {
+	if (!(pfilter = persistent_filter_create(rfilter, "./pfilter.cfg"))) {
+		fprintf(stderr, "couldn't build filter\n");
+		exit(1);
+	}
+
+	if (!(iter = dev_iter_create(pfilter))) {
+		log_err("couldn't create iterator");
+		exit(1);
+	}
+
+	fprintf(stderr, "filling cache\n");
+	while ((dev = dev_iter_get(iter)))
+		;
+	dev_iter_destroy(iter);
+
+	fprintf(stderr, "dumping\n");
+	if (!persistent_filter_dump(pfilter)) {
+		fprintf(stderr, "couldn't dump pfilter\n");
+		exit(1);
+	}
+
+	fprintf(stderr, "loading\n");
+	if (!persistent_filter_load(pfilter)) {
+		fprintf(stderr, "couldn't load pfilter\n");
+		exit(1);
+	}
+
+	if (!(iter = dev_iter_create(pfilter))) {
 		log_err("couldn't create iterator");
 		exit(1);
 	}
@@ -55,8 +102,9 @@ int main(int argc, char **argv)
 		printf("%s\n", dev->name);
 
 	dev_iter_destroy(iter);
-	filter->destroy(filter);
+	pfilter->destroy(pfilter);
 	dev_cache_exit();
+	destroy_config_file(cf);
 
 	dump_memory();
 	fin_log();