DEBUG ACTIVO
URL original: [https://www.youtube.com/embed/H6rESQwm8UM?si=bjZ15nfsLOBOeObf]
Largo: 61
Array
(
    [scheme] => https
    [host] => www.youtube.com
    [path] => /embed/H6rESQwm8UM
    [query] => si=bjZ15nfsLOBOeObf
)

Video ID detectado: [H6rESQwm8UM]
Pasa el regex? SI