diff --git a/src/ffx/media_descriptor.py b/src/ffx/media_descriptor.py
index d4bb69a..6b4d0ee 100644
--- a/src/ffx/media_descriptor.py
+++ b/src/ffx/media_descriptor.py
@@ -30,7 +30,7 @@ class MediaDescriptor:
     EXCLUDED_MEDIA_TAGS = ["creation_time"]
 
     SEASON_EPISODE_STREAM_LANGUAGE_DISPOSITIONS_MATCH = '[sS]([0-9]+)[eE]([0-9]+)_([0-9]+)_([a-z]{3})(?:_([A-Z]{3}))*'
-    STREAM_LANGUAGE_DISPOSITIONS_MATCH = '[sS]([0-9]+)[eE]([0-9]+)_([0-9]+)_([a-z]{3})(?:_([A-Z]{3}))*'
+    STREAM_LANGUAGE_DISPOSITIONS_MATCH = '([0-9]+)_([a-z]{3})(?:_([A-Z]{3}))*'
 
     SUBTITLE_FILE_EXTENSION = 'vtt'