diff --git a/src/sarif_v2.1.0_schema.json b/src/sarif_v2.1.0_schema.json
index 81f757ccf..41b12d4af 100644
--- a/src/sarif_v2.1.0_schema.json
+++ b/src/sarif_v2.1.0_schema.json
@@ -2339,9 +2339,8 @@
           "description": "The language of the messages emitted into the log file during this run (expressed as an ISO 639-1 two-letter lowercase culture code) and an optional region (expressed as an ISO 3166-1 two-letter uppercase subculture code associated with a country or region). The casing is recommended but not required (in order for this data to conform to RFC5646).",
           "type": "string",
           "default": "en-US",
-          "pattern": "^[a-zA-Z]{2}|^[a-zA-Z]{2}-[a-zA-Z]{2}]?$"
+          "pattern": "^[a-zA-Z]{2}(-[a-zA-Z]{2})?$"
         },
-
         "versionControlProvenance": {
           "description": "Specifies the revision in version control of the artifacts that were scanned.",
           "type": "array",
@@ -3040,7 +3039,7 @@
           "description": "The language of the messages emitted into the log file during this run (expressed as an ISO 639-1 two-letter lowercase language code) and an optional region (expressed as an ISO 3166-1 two-letter uppercase subculture code associated with a country or region). The casing is recommended but not required (in order for this data to conform to RFC5646).",
           "type": "string",
           "default": "en-US",
-          "pattern": "^[a-zA-Z]{2}|^[a-zA-Z]{2}-[a-zA-Z]{2}]?$"
+          "pattern": "^[a-zA-Z]{2}(-[a-zA-Z]{2})?$"
         },
 
         "contents": {