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-rw-r--r--youtube_dl/utils.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/youtube_dl/utils.py b/youtube_dl/utils.py
index 8cefafd79..d5fb6fd24 100644
--- a/youtube_dl/utils.py
+++ b/youtube_dl/utils.py
@@ -3640,7 +3640,7 @@ def url_or_none(url):
     if not url or not isinstance(url, compat_str):
         return None
     url = url.strip()
-    return url if re.match(r'^(?:[a-zA-Z][\da-zA-Z.+-]*:)?//', url) else None
+    return url if re.match(r'^(?:(?:https?|rt(?:m(?:pt?[es]?|fp)|sp[su]?)|mms|ftps?):)?//', url) else None
 
 
 def parse_duration(s):