From af03000ad5a445f03fbacb63ce626f8dcfe785c7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sergey=20M=E2=80=A4?= <dstftw@gmail.com>
Date: Sat, 21 Jul 2018 18:01:06 +0700
Subject: [utils] Introduce url_or_none

---
 youtube_dl/utils.py | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'youtube_dl')

diff --git a/youtube_dl/utils.py b/youtube_dl/utils.py
index b8700efcb..b84436ed6 100644
--- a/youtube_dl/utils.py
+++ b/youtube_dl/utils.py
@@ -1866,6 +1866,13 @@ def strip_or_none(v):
     return None if v is None else v.strip()
 
 
+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
+
+
 def parse_duration(s):
     if not isinstance(s, compat_basestring):
         return None
-- 
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