What's wrong?

[Khang-NT]

Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2017.02.10. If it's not read this FAQ entry and update. Issues with outdated version will be rejected.

• I've verified and I assure that I'm running youtube-dl 2017.02.10

Before submitting an issue make sure you have:

• At least skimmed through README and most notably FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones

What is the purpose of your issue?

• Bug report (encountered problems with youtube-dl)
• Site support request (request for adding support for a new site)
• Feature request (request for a new functionality)
• Question
• Other

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$ youtube-dl -j URLKpFztRFs -v
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-j', 'URLKpFztRFs', '-v']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2017.02.07
[debug] Python version 3.5.2 - Darwin-16.4.0-x86_64-i386-64bit
[debug] exe versions: ffmpeg 3.1.3, ffprobe 3.1.3
[debug] Proxy map: {}
ERROR: You've asked youtube-dl to download the URL "URLKpFztRFs". That doesn't make any sense. Simply remove the parameter in your command or configuration.
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/youtube_dl/YoutubeDL.py", line 696, in extract_info
    ie_result = ie.extract(url)
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/youtube_dl/extractor/common.py", line 369, in extract
    return self._real_extract(url)
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/youtube_dl/extractor/commonmistakes.py", line 29, in _real_extract
    raise ExtractorError(msg, expected=True)
youtube_dl.utils.ExtractorError: You've asked youtube-dl to download the URL "URLKpFztRFs". That doesn't make any sense. Simply remove the parameter in your command or configuration.

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I gave exactly 11 characters of YouTube video ID, but youtube-dl throws this exception, I think this is regex problem.

Another thing, I just wanna announce my comment on a closed issue.
#12035