Fine tuning fix for #6151

[Asadullah-Ahmad]

Can some contributor please look at a742c00 and suggest why _search_regex is having issues with that string, so it can be cleaned up for a possible merge/pull.

I came up with that search string by trial and error and can't shake that warning off. If I don't pass fatal=False flag, it raises RegexNotFoundError. Otherwise, it extracts the video_url successfully while still warning that it didn't execute search properly. I tried substituting .{30} with the exact string, but that didn't make a difference.

[jaimeMF]

I guess that not all formats are available for each video so some of the regex won't be found. You should probably use default=None instead.