diff --git a/tagexpr.go b/tagexpr.go
index c68d60c..8316ea0 100644
--- a/tagexpr.go
+++ b/tagexpr.go
@@ -310,19 +310,27 @@ func (s *structVM) copySubFields(field *fieldVM, sub *structVM) {
 	nameSpace := field.structField.Name
 	offset := field.offset
 	ptrDeep := field.ptrDeep
-	omitExpr := field.tagOp == tagOmit
+	tagOp := field.tagOp
+	omitExpr := tagOp == tagOmit
 	for _, k := range sub.fieldSelectorList {
 		v := sub.fields[k]
 		valueGetter := v.valueGetter
 		reflectValueGetter := v.reflectValueGetter
 		f := &fieldVM{
-			structField: v.structField,
-			offset:      offset + v.offset,
-			origin:      v.origin,
-			exprs:       make(map[string]*Expr, len(v.exprs)),
+			structField:            v.structField,
+			offset:                 offset,
+			exprs:                  make(map[string]*Expr, len(v.exprs)),
+			ptrDeep:                v.ptrDeep,
+			elemType:               v.elemType,
+			elemKind:               v.elemKind,
+			origin:                 v.origin,
+			mapKeyStructVM:         v.mapKeyStructVM,
+			mapOrSliceElemStructVM: v.mapOrSliceElemStructVM,
+			mapOrSliceIfaceKinds:   v.mapOrSliceIfaceKinds,
 		}
 
 		if !omitExpr {
+			f.tagOp = v.tagOp
 			var selector string
 			for k, v := range v.exprs {
 				selector = nameSpace + FieldSeparator + k
@@ -330,6 +338,8 @@ func (s *structVM) copySubFields(field *fieldVM, sub *structVM) {
 				s.exprs[selector] = v
 				s.exprSelectorList = append(s.exprSelectorList, selector)
 			}
+		} else {
+			f.tagOp = tagOp
 		}
 
 		if valueGetter != nil {
diff --git a/tagexpr_test.go b/tagexpr_test.go
index 4416f0e..f9b438c 100644
--- a/tagexpr_test.go
+++ b/tagexpr_test.go
@@ -717,12 +717,13 @@ func TestNilField(t *testing.T) {
 	type (
 		N struct {
 			X  string                 `tagexpr:"len($)>0"`
-			N  *N                     `tagexpr:"?"`
 			S  []*N                   `tagexpr:"?"`
 			M  map[string]*N          `tagexpr:"?"`
 			I  interface{}            `tagexpr:"-"`
 			MI map[string]interface{} `tagexpr:"?"`
 			SI []interface{}
+			*N `tagexpr:"?"`
+			N2 *N `tagexpr:"?"`
 		}
 		M struct {
 			X string `tagexpr:"len($)>0"`
@@ -730,7 +731,6 @@ func TestNilField(t *testing.T) {
 	)
 	n := &N{
 		X:  "n",
-		N:  nil,
 		S:  []*N{nil},
 		M:  map[string]*N{"": nil},
 		I:  new(N),
diff --git a/validator/README.md b/validator/README.md
index 2c3c5cf..04f7092 100644
--- a/validator/README.md
+++ b/validator/README.md
@@ -27,11 +27,14 @@ import (
 
 func Example() {
 	type InfoRequest struct {
-		Name   string `vd:"($!='Alice'||(Age)$==18) && regexp('\\w')"`
-		Age    int    `vd:"$>0"`
-		Email  string `vd:"email($)"`
-		Phone1 string `vd:"phone($)"`
-		Phone2 string `vd:"phone($,'CN')"`
+		Name         string `vd:"($!='Alice'||(Age)$==18) && regexp('\\w')"`
+		Age          int    `vd:"$>0"`
+		Email        string `vd:"email($)"`
+		Phone1       string `vd:"phone($)"`
+		Phone2       string `vd:"phone($,'CN')"`
+		*InfoRequest `vd:"?"`
+		Info1        *InfoRequest `vd:"?"`
+		Info2        *InfoRequest `vd:"-"`
 	}
 	info := InfoRequest{
 		Name:   "Alice",
diff --git a/validator/example_test.go b/validator/example_test.go
index b5fa677..623a82d 100644
--- a/validator/example_test.go
+++ b/validator/example_test.go
@@ -8,11 +8,14 @@ import (
 
 func Example() {
 	type InfoRequest struct {
-		Name   string `vd:"($!='Alice'||(Age)$==18) && regexp('\\w')"`
-		Age    int    `vd:"$>0"`
-		Email  string `vd:"email($)"`
-		Phone1 string `vd:"phone($)"`
-		Phone2 string `vd:"phone($,'CN')"`
+		Name         string `vd:"($!='Alice'||(Age)$==18) && regexp('\\w')"`
+		Age          int    `vd:"$>0"`
+		Email        string `vd:"email($)"`
+		Phone1       string `vd:"phone($)"`
+		Phone2       string `vd:"phone($,'CN')"`
+		*InfoRequest `vd:"?"`
+		Info1        *InfoRequest `vd:"?"`
+		Info2        *InfoRequest `vd:"-"`
 	}
 	info := InfoRequest{
 		Name:   "Alice",