Intents: handeling special charakters in Sentences

Got a litle further with escaping characters thanks to Ludeeus.
but the problem so far are the special characters inside of the Sentences

hangouts:
  intents:
    youtube: 
      sentences:
        - https://www.youtube.com/watch\?v\={ytlink2}
intent_script:
  youtube:
    speech:
      text: casting {{ ytlink2 }} 
    action:
      - service: media_extractor.play_media
        data_template:
          media_content_id: "https://youtu.be/{{ytlink2}}"
          entity_id: media_player.chromecast_wz
          media_content_type: video

This works with links like:
https://www.youtube.com/watch?v=B5KmQm3eKcU
but not with https://www.youtube.com/watch?v=p3-pGKE9824

https://www.youtube.com/watch\?v\={\ytlink2\} gives an error with

  File "/usr/local/lib/python3.7/re.py", line 234, in compile
    return _compile(pattern, flags)
  File "/usr/local/lib/python3.7/re.py", line 286, in _compile
    p = sre_compile.compile(pattern, flags)
  File "/usr/local/lib/python3.7/sre_compile.py", line 764, in compile
    p = sre_parse.parse(p, flags)
  File "/usr/local/lib/python3.7/sre_parse.py", line 930, in parse
    p = _parse_sub(source, pattern, flags & SRE_FLAG_VERBOSE, 0)
  File "/usr/local/lib/python3.7/sre_parse.py", line 426, in _parse_sub
    not nested and not items))
  File "/usr/local/lib/python3.7/sre_parse.py", line 507, in _parse
    code = _escape(source, this, state)
  File "/usr/local/lib/python3.7/sre_parse.py", line 402, in _escape
    raise source.error("bad escape %s" % escape, len(escape))
re.error: bad escape \y at position 36

same with normal sentences

tts hello 
I know hello

tts hello space 123
I know hello space 123

hello. a single dot is braking everything
Sorry, I didn't understand that