From cbdba6fdf0495c130d5d7744a91ef934654c2dab Mon Sep 17 00:00:00 2001
From: xavier <xavier.gourmandin@gmail.com>
Date: Wed, 14 Feb 2024 11:36:53 +0100
Subject: [PATCH] feat: Add a tag validation method

---
 validator_instance.go | 19 +++++++++++++++++++
 validator_test.go     |  8 ++++++++
 2 files changed, 27 insertions(+)

diff --git a/validator_instance.go b/validator_instance.go
index d5a7be1de..cc69feb75 100644
--- a/validator_instance.go
+++ b/validator_instance.go
@@ -707,3 +707,22 @@ func (v *Validate) VarWithValueCtx(ctx context.Context, field interface{}, other
 	v.pool.Put(vd)
 	return
 }
+
+// ValidateTag validates a tag. It's main purpose is to be used when validating values directly via the Var, VarCtx,
+// VarWithValue and VarWithValueCtx methods to know beforehand if the tag is known by the library instead of managing
+// a panic error.
+//
+// Parameters:
+// tag (string): The tag to be validated.
+//
+// Returns:
+// error: An error signaling the given tag is invalid.
+func (v *Validate) ValidateTag(tag string) (err error) {
+	defer func() {
+		if r := recover(); r != nil {
+			err = fmt.Errorf("error parsing tag: %v", r)
+		}
+	}()
+	v.parseFieldTagsRecursive(tag, "", "", false)
+	return err
+}
diff --git a/validator_test.go b/validator_test.go
index 2826ae70e..b545a08af 100644
--- a/validator_test.go
+++ b/validator_test.go
@@ -13692,3 +13692,11 @@ func TestOmitNilAndRequired(t *testing.T) {
 		AssertError(t, err2, "OmitNil.Inner.Str", "OmitNil.Inner.Str", "Str", "Str", "required")
 	})
 }
+
+func TestValidate_ValidateTag(t *testing.T) {
+	validate := New()
+	err := validate.ValidateTag("nonexsiting,nonexisting2")
+	NotEqual(t, err, nil)
+	err = validate.ValidateTag("required,email")
+	Equal(t, err, nil)
+}