[utils] Fix urljoin for paths with non-http(s) schemes

1 files changed, 1 insertions, 1 deletions

diff --git a/youtube_dl/utils.py b/youtube_dl/utils.py
index d2d3c1a9f..d0cb65814 100644
--- a/youtube_dl/utils.py
+++ b/youtube_dl/utils.py
@@ -1868,7 +1868,7 @@ def urljoin(base, path):
         path = path.decode('utf-8')
     if not isinstance(path, compat_str) or not path:
         return None
-    if re.match(r'^(?:https?:)?//', path):
+    if re.match(r'^(?:[a-zA-Z][a-zA-Z0-9+-.]*:)?//', path):
         return path
     if isinstance(base, bytes):
         base = base.decode('utf-8')