From f43c965fa6e3a1290af6655c47d5f56602fc5e82 Mon Sep 17 00:00:00 2001
From: raihata <297775639+raihata@users.noreply.github.com>
Date: Thu, 9 Jul 2026 16:44:21 +0900
Subject: [PATCH] feat(3504): Allow @ in meta key validation

---
 meta.go      | 2 +-
 meta_test.go | 5 +++++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/meta.go b/meta.go
index 26d0183..84e2479 100644
--- a/meta.go
+++ b/meta.go
@@ -36,7 +36,7 @@ var (
 	date    = "unknown"
 )
 
-var metaKeyValidator = regexp.MustCompile(`^(\w+([-:]*\w+)*)+(((\[\]|\[(0|[1-9]\d*)\]))?(\.(\w+([-:]*\w+)*)+)*)*$`)
+var metaKeyValidator = regexp.MustCompile(`^(\w+([\-:@]*\w+)*)+(((\[\]|\[(0|[1-9]\d*)\]))?(\.(\w+([\-:@]*\w+)*)+)*)*$`)
 var rightBracketRegExp = regexp.MustCompile(`\[(.*?)\]`)
 var isNumberRegExp = regexp.MustCompile(`^[+-]?(?:[0-9]*[.])?[0-9]+$`)
 var metaKeyIsParameterRegExp = regexp.MustCompile(`^parameters(:?\.(.+))?`)
diff --git a/meta_test.go b/meta_test.go
index 8227d71..0c60906 100644
--- a/meta_test.go
+++ b/meta_test.go
@@ -764,6 +764,9 @@ func (s *MetaSuite) TestValidateMetaKeyWithAccept() {
 		{`f-o-o[1].bar--baz[2]`},
 		{`1.2.3`},
 		{`foo.b-a-r:baz:1-2-3[]`},
+		{`stage@test`},
+		{`stage@explicit-setup-and-teardown:setup`},
+		{`parameters.stage@test:teardown.test.value`},
 	}
 
 	for _, tt := range tests {
@@ -787,8 +790,10 @@ func (s *MetaSuite) TestValidateMetaKeyWithReject() {
 		{`foo.[]`},
 		{`-foo`},
 		{`foo-[]`},
+		{`foo@[]`},
 		{`foo.-bar`},
 		{`foo.bar-[]`},
+		{`@foo`},
 	}
 
 	for _, tt := range tests {