diff --git a/internal/app/cdn.go b/internal/app/cdn.go
index 066d420..c9748e4 100644
--- a/internal/app/cdn.go
+++ b/internal/app/cdn.go
@@ -7,10 +7,8 @@ import (
 	"regexp"
 	"strings"
 
-	"github.com/zu1k/nali/internal/tools"
-
 	"github.com/zu1k/nali/constant"
-
+	"github.com/zu1k/nali/internal/tools"
 	"github.com/zu1k/nali/pkg/cdn"
 )
 
@@ -20,7 +18,7 @@ var (
 )
 
 func init() {
-	domainRe = regexp.MustCompile(`[0-9A-Za-z]{2,}\.[0-9A-Za-z]{2,3}\.[0-9A-Za-z]{2,3}|[0-9A-Za-z]{2,}\.[0-9A-Za-z]{2,3}`)
+	domainRe = regexp.MustCompile(`[a-zA-Z0-9][-a-zA-Z0-9]{0,62}(\.[a-zA-Z0-9][-a-zA-Z0-9]{0,62})+`)
 }
 
 func InitCDNDB() {
diff --git a/internal/app/re_test.go b/internal/app/re_test.go
new file mode 100644
index 0000000..9cb7e36
--- /dev/null
+++ b/internal/app/re_test.go
@@ -0,0 +1,23 @@
+package app
+
+import (
+	"fmt"
+	"testing"
+)
+
+var domainList = []string{
+	"a.a.qiniudns.com",
+	"a.com.qiniudns.com",
+	"a.com.cn.qiniudns.com",
+	"看这里：a.com.cn.qiniudns.com行不行",
+}
+
+func TestDomainRe(t *testing.T) {
+	for _, domain := range domainList {
+		if !domainRe.MatchString(domain) {
+			t.Error(domain)
+			t.Fail()
+		}
+		fmt.Println(domainRe.FindAllString(domain, -1))
+	}
+}