here is some bash ;)
Code:
echo https://youtube.com/watch?v=sGgOM1UsqtE | grep -E 'v=[A-Za-z0-9_-]' | cut -d "=" -f 2
Code:
var='https://youtube.com/watch?v=sGgOM1UsqtE'; echo "${var#*v=}"
Code:
var='https://youtube.com/watch?v=sGgOM1UsqtE'; echo "${var##*[?&]v=}"
;)