diff --git a/hosts.go b/hosts.go
index 360efe8..c234ef7 100644
--- a/hosts.go
+++ b/hosts.go
@@ -4,7 +4,6 @@ import (
 	"bufio"
 	"net"
 	"os"
-	"regexp"
 	"strings"
 	"sync"
 	"time"
@@ -240,15 +239,3 @@ func (f *FileHosts) Refresh() {
 func (f *FileHosts) clear() {
 	f.hosts = make(map[string]string)
 }
-
-func isDomain(domain string) bool {
-	if isIP(domain) {
-		return false
-	}
-	match, _ := regexp.MatchString(`^([a-zA-Z0-9\*]([a-zA-Z0-9\-]{0,61}[a-zA-Z0-9])?\.)+[a-zA-Z]{2,6}$`, domain)
-	return match
-}
-
-func isIP(ip string) bool {
-	return (net.ParseIP(ip) != nil)
-}
diff --git a/utils.go b/utils.go
new file mode 100644
index 0000000..1993d59
--- /dev/null
+++ b/utils.go
@@ -0,0 +1,18 @@
+package main
+
+import (
+	"net"
+	"regexp"
+)
+
+func isDomain(domain string) bool {
+	if isIP(domain) {
+		return false
+	}
+	match, _ := regexp.MatchString(`^([a-zA-Z0-9\*]([a-zA-Z0-9\-]{0,61}[a-zA-Z0-9])?\.)+[a-zA-Z]{2,6}$`, domain)
+	return match
+}
+
+func isIP(ip string) bool {
+	return (net.ParseIP(ip) != nil)
+}
diff --git a/hosts_test.go b/utils_test.go
similarity index 100%
rename from hosts_test.go
rename to utils_test.go