diff --git a/cli.go b/cli.go
index 6e2bbd6..cd7be85 100644
--- a/cli.go
+++ b/cli.go
@@ -30,8 +30,8 @@ type request struct {
 	promAddr     string
 	serverName   string
 	srcAddr      string
-	filter       string
 	config       string
+	filter       map[string]struct{}
 
 	soIPTOS       int
 	soIPTTL       int
@@ -178,9 +178,9 @@ func getCli(args []string) (*request, []string, error) {
 				grpcAddr:     c.String("grpc-addr"),
 				serverName:   c.String("server-name"),
 				srcAddr:      c.String("source-addr"),
-				filter:       c.String("filter"),
 				config:       c.String("config"),
 				count:        c.Int("count"),
+				filter:       filterMap(c.String("filter")),
 
 				soIPTOS:      c.Int("tos"),
 				soIPTTL:      c.Int("ttl"),
@@ -260,3 +260,15 @@ for more information: https://github.com/mehrdadrad/tcpprobe/wiki
 
 	return r, targets, err
 }
+
+func filterMap(s string) map[string]struct{} {
+	m := map[string]struct{}{}
+	if len(s) < 1 {
+		return m
+	}
+
+	for _, f := range strings.Split(strings.ToLower(s), ";") {
+		m[f] = struct{}{}
+	}
+	return m
+}
diff --git a/printer.go b/printer.go
index 362c877..9bad42d 100644
--- a/printer.go
+++ b/printer.go
@@ -27,7 +27,7 @@ func (c *client) printer(counter int) {
 
 func (c *client) printText(counter int) {
 	v := reflect.ValueOf(c.stats)
-	filter := strings.ToLower(c.req.filter)
+	filterLen := len(c.req.filter)
 
 	ip, _, _ := net.SplitHostPort(c.addr)
 	datetime := time.Unix(c.timestamp, 0).Format(time.RFC3339)
@@ -37,7 +37,7 @@ func (c *client) printText(counter int) {
 		if f.Tag.Get("unexported") == "true" {
 			continue
 		}
-		if strings.Contains(filter, strings.ToLower(f.Name)) || filter == "" {
+		if _, ok := c.req.filter[strings.ToLower(f.Name)]; ok || filterLen == 0 {
 			fmt.Printf("%s:%v ", f.Name, v.Field(i).Interface())
 		}
 	}
@@ -65,7 +65,7 @@ func (c *client) printJSON(counter int, pretty bool) {
 		c.stats,
 	}
 
-	if c.req.filter != "" {
+	if len(c.req.filter) > 0 {
 		b, err = jsonMarshalFilter(d, c.req.filter, pretty)
 	} else if pretty {
 		b, err = json.MarshalIndent(d, "", "  ")
@@ -81,7 +81,7 @@ func (c *client) printJSON(counter int, pretty bool) {
 	fmt.Println(string(b))
 }
 
-func jsonMarshalFilter(s interface{}, filter string, pretty bool) ([]byte, error) {
+func jsonMarshalFilter(s interface{}, filter map[string]struct{}, pretty bool) ([]byte, error) {
 	var m map[string]interface{}
 
 	b, err := json.Marshal(s)
@@ -91,10 +91,8 @@ func jsonMarshalFilter(s interface{}, filter string, pretty bool) ([]byte, error
 
 	json.Unmarshal(b, &m)
 
-	lFilter := strings.ToLower(filter)
-
 	for k := range m {
-		if !strings.Contains(lFilter, strings.ToLower(k)) {
+		if _, ok := filter[strings.ToLower(k)]; !ok {
 			delete(m, k)
 		}
 	}
diff --git a/tp_test.go b/tp_test.go
index 1436751..5b4ffab 100644
--- a/tp_test.go
+++ b/tp_test.go
@@ -221,7 +221,7 @@ func TestPrintText(t *testing.T) {
 	r, w, _ := os.Pipe()
 	os.Stdout = w
 
-	c := &client{stats: stats{Rtt: 5}, req: &request{filter: "rtt"}, timestamp: 1609558015}
+	c := &client{stats: stats{Rtt: 5}, req: &request{filter: map[string]struct{}{"rtt": struct{}{}}}, timestamp: 1609558015}
 	c.printer(0)
 
 	go io.Copy(buf, r)
@@ -236,7 +236,7 @@ func TestPrintJsonPretty(t *testing.T) {
 	r, w, _ := os.Pipe()
 	os.Stdout = w
 
-	c := &client{stats: stats{}, req: &request{jsonPretty: true, filter: "rtt"}}
+	c := &client{stats: stats{}, req: &request{jsonPretty: true, filter: map[string]struct{}{"rtt": struct{}{}}}}
 	c.printer(0)
 
 	buf := make([]byte, 13)
@@ -252,7 +252,7 @@ func TestPrintJson(t *testing.T) {
 	r, w, _ := os.Pipe()
 	os.Stdout = w
 
-	c := &client{stats: stats{}, req: &request{json: true, filter: "rtt"}}
+	c := &client{stats: stats{}, req: &request{json: true, filter: map[string]struct{}{"rtt": struct{}{}}}}
 	c.printer(0)
 
 	buf := make([]byte, 9)