diff --git a/deploy/Jenkinsfile b/deploy/Jenkinsfile
index 86a5a47..18658da 100644
--- a/deploy/Jenkinsfile
+++ b/deploy/Jenkinsfile
@@ -226,7 +226,9 @@ pipeline {
             esac
             RENDERED_MANIFEST="$TMP_DIR/manifest.yaml"
             envsubst "$K8S_RENDER_VARS" < deploy/k8s/kra.yaml > "$RENDERED_MANIFEST"
-            if grep -nE '\$\{[A-Z_][A-Z0-9_]*\}' "$RENDERED_MANIFEST"; then
+            # Groovy 三单引号字符串内反斜杠仍是转义前缀：
+            # 本行正则里的反斜杠序列必须双写，shell 才能收到 grep -E 需要的单反斜杠模式。
+            if grep -nE '\\$\\{[A-Z_][A-Z0-9_]*\\}' "$RENDERED_MANIFEST"; then
               echo 'Rendered Kubernetes manifest contains unresolved template variables' >&2
               exit 1
             fi