[reddit] support comment share link (#8434)

gallery_dl/extractor/reddit.py

@@ -317,8 +317,8 @@ class RedditSubmissionExtractor(RedditExtractor):
     """Extractor for URLs from a submission on reddit.com"""
     subcategory = "submission"
     pattern = (r"(?:https?://)?(?:"
-               r"(?:\w+\.)?reddit\.com/(?:(?:r|u|user)/[^/?#]+"
-               r"/comments|gallery)|redd\.it)/([a-z0-9]+)")
+               r"(?:\w+\.)?reddit\.com/(?:(?:(?:r|u|user)/[^/?#]+/)?"
+               r"comments|gallery)|redd\.it)/([a-z0-9]+)")
     example = "https://www.reddit.com/r/SUBREDDIT/comments/id/"
 
     def __init__(self, match):

test/results/reddit.py

@@ -179,6 +179,15 @@ __tests__ = (
     "#count"   : 0,
 },
 
+{
+    "#url"     : "https://www.reddit.com/comments/1nz2ic5",
+    "#comment" : "comment share URL",
+    "#category": ("", "reddit", "submission"),
+    "#class"   : reddit.RedditSubmissionExtractor,
+    "#pattern" : r"https://i\.redd\.it/\w+\.png",
+    "#count"   : 2,
+},
+
 {
     "#url"     : "https://www.reddit.com/r/RobloxArt/comments/15ko0qu/",
     "#comment" : "comment embeds (#5366)",