diff --git a/issues_test.go b/issues_test.go
index bd867f9..4eebb75 100644
--- a/issues_test.go
+++ b/issues_test.go
@@ -1915,3 +1915,38 @@ func TestIssue_302(t *testing.T) {
 	assert.True(t, v.Validate())
 	assert.Empty(t, v.Errors.One())
 }
+
+func TestIssue_328(t *testing.T) {
+	type Test struct {
+		Domains []string `form:"domains" json:"domains" validate:"required|isSlice"`
+		Index   []string `form:"index" json:"index" validate:"required|isSlice"`
+	}
+
+	t.Run("success_with_struct", func(t *testing.T) {
+		df, err := validate.FromStruct(&Test{
+			Domains: []string{"example.com", "test.com", "a.com"},
+			Index:   []string{"index.php"},
+		})
+		assert.NoError(t, err)
+		v := df.Create()
+		v.StringRule("Domains.*", "required")
+		v.StringRule("Index.*", "required")
+
+		assert.True(t, v.Validate())
+	})
+
+	t.Run("success_with_json", func(t *testing.T) {
+		data := `{"domains":["example.com","test.com","a.com"],"index":["index.php"]}`
+		req := new(Test)
+		err := jsonutil.DecodeString(data, req)
+		assert.NoError(t, err)
+
+		df, err := validate.FromStruct(req)
+		assert.NoError(t, err)
+		v := df.Create()
+		v.StringRule("Domains.*", "required")
+		v.StringRule("Index.*", "required")
+
+		assert.True(t, v.Validate())
+	})
+}
diff --git a/validating.go b/validating.go
index c3257d7..622d1d5 100644
--- a/validating.go
+++ b/validating.go
@@ -299,17 +299,17 @@ func (r *Rule) valueValidate(field, name string, val any, v *Validation) (ok boo
 	valKind := rftVal.Kind()
 
 	if valKind == reflect.Slice && dotStarNum > 0 {
-		sliceLen, sliceCap := rftVal.Len(), rftVal.Cap()
+		sliceLen := rftVal.Len()
 
 		// if dotStarNum > 1, need flatten multi level slice with depth=dotStarNum.
 		if dotStarNum > 1 {
 			rftVal = flatSlice(rftVal, dotStarNum-1)
-			sliceLen, sliceCap = rftVal.Len(), rftVal.Cap()
+			sliceLen = rftVal.Len()
 		}
 
 		// check requiredXX validate - flatten multi level slice, count ".*" number.
-		// TIP: if len < cap: not enough elements in the slice. use empty val call validator.
-		if !r.nameNotRequired && sliceLen < sliceCap {
+		// TIP: if len == 0: no elements in the slice. use empty val call validator.
+		if !r.nameNotRequired && sliceLen == 0 {
 			return callValidator(v, fm, field, nil, r.arguments, addNum)
 		}