diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index 4ea884e..2ad9e1e 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -36,25 +36,20 @@ jobs:
         # a pull request then we can checkout the head.
         fetch-depth: 2
 
-    # If this run was triggered by a pull request event, then checkout
-    # the head of the pull request instead of the merge commit.
-    - run: git checkout HEAD^2
-      if: ${{ github.event_name == 'pull_request' }}
-
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL
-      uses: github/codeql-action/init@v2
+      uses: github/codeql-action/init@v3
       with:
         languages: ${{ matrix.language }}
         # If you wish to specify custom queries, you can do so here or in a config file.
-        # By default, queries listed here will override any specified in a config file. 
+        # By default, queries listed here will override any specified in a config file.
         # Prefix the list here with "+" to use these queries and those in the config file.
         # queries: ./path/to/local/query, your-org/your-repo/queries@main
 
     # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
     # If this step fails, then you should remove it and run the build manually (see below)
     - name: Autobuild
-      uses: github/codeql-action/autobuild@v2
+      uses: github/codeql-action/autobuild@v3
 
     # ℹ️ Command-line programs to run using the OS shell.
     # 📚 https://git.io/JvXDl
@@ -68,4 +63,4 @@ jobs:
     #   make release
 
     - name: Perform CodeQL Analysis
-      uses: github/codeql-action/analyze@v2
+      uses: github/codeql-action/analyze@v3
diff --git a/validator/cmp.go b/validator/cmp.go
index ed29bd6..f80afa5 100644
--- a/validator/cmp.go
+++ b/validator/cmp.go
@@ -11,7 +11,6 @@ func Between[T cmp.Ordered](min, max T) func(T) bool {
 	if max < min {
 		panic("max 必须大于等于 min")
 	}
-
 	return func(val T) bool { return val > min && val < max }
 }
 
@@ -20,25 +19,16 @@ func BetweenEqual[T cmp.Ordered](min, max T) func(T) bool {
 	if max < min {
 		panic("max 必须大于等于 min")
 	}
-
 	return func(val T) bool { return val >= min && val <= max }
 }
 
-func Less[T cmp.Ordered](num T) func(T) bool {
-	return func(t T) bool { return t < num }
-}
+func Less[T cmp.Ordered](num T) func(T) bool { return func(t T) bool { return t < num } }
 
-func LessEqual[T cmp.Ordered](num T) func(T) bool {
-	return func(t T) bool { return t <= num }
-}
+func LessEqual[T cmp.Ordered](num T) func(T) bool { return func(t T) bool { return t <= num } }
 
-func Great[T cmp.Ordered](num T) func(T) bool {
-	return func(t T) bool { return t > num }
-}
+func Great[T cmp.Ordered](num T) func(T) bool { return func(t T) bool { return t > num } }
 
-func GreatEqual[T cmp.Ordered](num T) func(T) bool {
-	return func(t T) bool { return t >= num }
-}
+func GreatEqual[T cmp.Ordered](num T) func(T) bool { return func(t T) bool { return t >= num } }
 
 // HTTPStatus 是否为有效的 HTTP 状态码
 func HTTPStatus(s int) bool { return BetweenEqual(100, 599)(s) }
diff --git a/validator/string.go b/validator/string.go
index 59dbf7a..1c99205 100644
--- a/validator/string.go
+++ b/validator/string.go
@@ -11,6 +11,7 @@ import (
 	"strings"
 
 	"github.com/google/uuid"
+
 	"github.com/issue9/webfilter/gb11643"
 	"github.com/issue9/webfilter/gb32100"
 	"github.com/issue9/webfilter/internal/isbn"
@@ -48,6 +49,9 @@ func IP6(val string) bool {
 	return err == nil && ip.Is6()
 }
 
+// IP 判断是否 IP 地址
+//
+// 同时支持 [IP4] 和 [IP6]
 func IP(val string) bool {
 	_, err := netip.ParseAddr(val)
 	return err == nil
@@ -55,7 +59,7 @@ func IP(val string) bool {
 
 // ISBN 判断是否为合法的 [ISBN] 串号
 //
-// 可以同时判断 ISBN10 和 ISBN13
+// 可以同时判断 [ISBN10] 和 [ISBN13]
 //
 // [ISBN]: https://zh.wikipedia.org/wiki/%E5%9B%BD%E9%99%85%E6%A0%87%E5%87%86%E4%B9%A6%E5%8F%B7
 func ISBN(val string) bool { return isbn.IsValid([]byte(val)) }
@@ -132,11 +136,6 @@ func Alpha(s string) bool {
 	return true
 }
 
-// EmptyOr 空字符串或是非空的情况下满足 v 的条件
-func EmptyOr(v func(string) bool) func(string) bool {
-	return Or(func(s string) bool { return s == "" }, v)
-}
-
 // CNMobile 验证中国大陆的手机号码
 func CNMobile(val string) bool {
 	// 可选的 0,86,086,+86
@@ -175,3 +174,6 @@ func Digit(val string) bool {
 
 // UUID 验证 UUID 格式是否正确
 func UUID(val string) bool { return uuid.Validate(val) == nil }
+
+// Empty 字符串是否为空
+func Empty(val string) bool { return val == "" }
diff --git a/validator/validator.go b/validator/validator.go
index d64b02a..e5fc93e 100644
--- a/validator/validator.go
+++ b/validator/validator.go
@@ -53,19 +53,18 @@ func Or[T any](v ...func(T) bool) func(T) bool {
 }
 
 // Not 验证器的取反
-func Not[T any](v func(T) bool) func(T) bool {
-	return func(val T) bool { return !v(val) }
-}
+func Not[T any](v func(T) bool) func(T) bool { return func(val T) bool { return !v(val) } }
 
+// Zero 是否为零值
+//
+// 采用 [reflect.Value.IsZero] 判断。
 func Zero[T any](v T) bool { return reflect.ValueOf(v).IsZero() }
 
 // Equal 生成判断值是否等于 v 的验证器
-func Equal[T comparable](v T) func(T) bool {
-	return func(t T) bool { return t == v }
-}
+func Equal[T comparable](v T) func(T) bool { return func(t T) bool { return t == v } }
 
-func NilOr[T any](v func(T) bool) func(T) bool {
-	return Or(func(v T) bool { return reflect.ValueOf(v).IsNil() }, v)
-}
+// Nil 是否为 nil
+func Nil[T any](v T) bool { return reflect.ValueOf(v).IsNil() }
 
+// JSON 验证是否为正确的 JSON 内容
 func JSON(val []byte) bool { return json.Valid(val) }
diff --git a/webfilter.go b/webfilter.go
index 2c08632..065f74d 100644
--- a/webfilter.go
+++ b/webfilter.go
@@ -4,5 +4,5 @@
 
 // Package webfilter 适合 [web.filter] 的过滤器
 //
-// [web/filter]: https://github.com/issue9/web
+// [web/filter]: https://github.com/issue9/web/filter
 package webfilter