Youtube id regex matcher

getYoutubeId.coffee

getYoutubeId = (url)->
  regExp = ///
    ^(?:https?:\/\/)? # Optionally checks if the string starts with http:// or https://
    (?:www\.)? # Optionally checks if the string has a www. (after the http, https or starts with it)
    youtu\.?be(?:\.com)? # Matches the youtube domain, which could be youtube.com or youtu.be
    \/(?:v\/|.*u\/\w\/|embed\/|watch\?v=)? # Matches the url paths that could go before the id, like /embed/ or /watch?v=
    ([^#\&\?]*) # (CAPTURING-GROUP) Matches any id-like string
    
    # Now if the pattern before did not find anything, we try the one below
    |^([0-9,a-zA-Z\-]+)$ #  (CAPTURING-GROUP) Matches any id-like string, so passing only the id will return it back
    ///i
  match = url.match(regExp)
  if match
    match[1] or match[2]
  else
    'error'