diff --git a/controllers/nginx/nginx/template/template.go b/controllers/nginx/nginx/template/template.go
index 55a3b04d8..a8380d0fa 100644
--- a/controllers/nginx/nginx/template/template.go
+++ b/controllers/nginx/nginx/template/template.go
@@ -52,6 +52,11 @@ var (
 		"buildProxyPass":      buildProxyPass,
 		"buildRateLimitZones": buildRateLimitZones,
 		"buildRateLimit":      buildRateLimit,
+		"contains":            strings.Contains,
+		"hasPrefix":           strings.HasPrefix,
+		"hasSuffix":           strings.HasSuffix,
+		"toUpper":             strings.ToUpper,
+		"toLower":             strings.ToLower,
 	}
 )