Repository: youtube-dl
Issue: Unable to extract post url - SyFy show
Labels: tv-provider-account-needed

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## Checklist

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Carefully read and work through this check list in order to prevent the most common mistakes and misuse of youtube-dl:
- First of, make sure you are using the latest version of youtube-dl. Run `youtube-dl --version` and ensure your version is 2021.04.07. If it's not, see https://yt-dl.org/update on how to update. Issues with outdated version will be REJECTED.
- Make sure that all provided video/audio/playlist URLs (if any) are alive and playable in a browser.
- Make sure that all URLs and arguments with special characters are properly quoted or escaped as explained in http://yt-dl.org/escape.
- Search the bugtracker for similar issues: http://yt-dl.org/search-issues. DO NOT post duplicates.
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- [X] I'm reporting a broken site support
- [X] I've verified that I'm running youtube-dl version **2021.04.07**
- [X] I've checked that all provided URLs are alive and playable in a browser
- [X] I've checked that all URLs and arguments with special characters are properly quoted or escaped
- [X] I've searched the bugtracker for similar issues including closed ones


## Verbose log

<!--
Provide the complete verbose output of youtube-dl that clearly demonstrates the problem.
Add the `-v` flag to your command line you run youtube-dl with (`youtube-dl -v <your command line>`), copy the WHOLE output and insert it below. It should look similar to this:
 [debug] System config: []
 [debug] User config: []
 [debug] Command-line args: [u'-v', u'http://www.youtube.com/watch?v=BaW_jenozKcj']
 [debug] Encodings: locale cp1251, fs mbcs, out cp866, pref cp1251
 [debug] youtube-dl version 2021.04.07
 [debug] Python version 2.7.11 - Windows-2003Server-5.2.3790-SP2
 [debug] exe versions: ffmpeg N-75573-g1d0487f, ffprobe N-75573-g1d0487f, rtmpdump 2.4
 [debug] Proxy map: {}
 <more lines>
-->

```
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['https://www.syfy.com/resident-alien/videos/110-heroes-of-patience', '--ap-mso', 'ATTOTT', '--ap-username', 'PRIVATE', '--ap-password', 'PRIVATE', '--verbose']
[debug] Encodings: locale UTF-8, fs utf-8, out utf-8, pref UTF-8
[debug] youtube-dl version 2021.04.07
[debug] Python version 3.9.4 (CPython) - macOS-11.2.3-x86_64-i386-64bit
[debug] exe versions: ffmpeg 4.3.2, ffprobe 4.3.2, rtmpdump 2.4
[debug] Proxy map: {}
[Syfy] 110-heroes-of-patience: Downloading webpage
[Syfy] 4333614: Downloading Provider Redirect Page
[Syfy] 4333614: Downloading Provider Login Page
ERROR: Unable to extract post url; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see  https://yt-dl.org/update  on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
Traceback (most recent call last):
  File "/usr/local/Cellar/youtube-dl/2021.4.7/libexec/lib/python3.9/site-packages/youtube_dl/YoutubeDL.py", line 806, in wrapper
    return func(self, *args, **kwargs)
  File "/usr/local/Cellar/youtube-dl/2021.4.7/libexec/lib/python3.9/site-packages/youtube_dl/YoutubeDL.py", line 827, in __extract_info
    ie_result = ie.extract(url)
  File "/usr/local/Cellar/youtube-dl/2021.4.7/libexec/lib/python3.9/site-packages/youtube_dl/extractor/common.py", line 534, in extract
    ie_result = self._real_extract(url)
  File "/usr/local/Cellar/youtube-dl/2021.4.7/libexec/lib/python3.9/site-packages/youtube_dl/extractor/syfy.py", line 46, in _real_extract
    query['auth'] = self._extract_mvpd_auth(
  File "/usr/local/Cellar/youtube-dl/2021.4.7/libexec/lib/python3.9/site-packages/youtube_dl/extractor/adobepass.py", line 1511, in _extract_mvpd_auth
    mvpd_confirm_page_res = post_form(provider_login_page_res, 'Logging in', {
  File "/usr/local/Cellar/youtube-dl/2021.4.7/libexec/lib/python3.9/site-packages/youtube_dl/extractor/adobepass.py", line 1365, in post_form
    post_url = self._html_search_regex(r'<form[^>]+action=(["\'])(?P<url>.+?)\1', form_page, 'post url', group='url')
  File "/usr/local/Cellar/youtube-dl/2021.4.7/libexec/lib/python3.9/site-packages/youtube_dl/extractor/common.py", line 1021, in _html_search_regex
    res = self._search_regex(pattern, string, name, default, fatal, flags, group)
  File "/usr/local/Cellar/youtube-dl/2021.4.7/libexec/lib/python3.9/site-packages/youtube_dl/extractor/common.py", line 1012, in _search_regex
    raise RegexNotFoundError('Unable to extract %s' % _name)
youtube_dl.utils.RegexNotFoundError: Unable to extract post url; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see  https://yt-dl.org/update  on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
```


## Description

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Trying download an episode from SyFy or NBC of the same show results in the above failure. All of the shows from the series are failing with the same error `Unable to extract post url;  please report this issue on https://yt-dl.org/bug`


https://www.syfy.com/resident-alien/videos/110-heroes-of-patience

https://www.nbc.com/resident-alien/video/heroes-of-patience/4333614