Article 5DTGR why do YouTube video codes have _ and - ?

why do YouTube video codes have _ and - ?

by
Skaperen
from LinuxQuestions.org on (#5DTGR)
does anyone know why YouTube uses _ and - in the video codes of their URLs?latest?d=yIl2AUoC8zA latest?i=qXsGeAXodAA:QG6UiOPwS3I:F7zBnMy latest?i=qXsGeAXodAA:QG6UiOPwS3I:V_sGLiP latest?d=qj6IDK7rITs latest?i=qXsGeAXodAA:QG6UiOPwS3I:gIN9vFwqXsGeAXodAA
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