youtubeShareUrlRegex top-level property
Can match:
https://youtu.be/<video_id>
https://www.youtube.com/embed/<video_id>
https://youtube.com/embed/<video_id>
Implementation
RegExp youtubeShareUrlRegex = RegExp(
'https://(www.)?(youtu.be|((youtube.com)(?:/embed)))/(?<video_id>[a-zA-Z_0-9]+)');