The query fragment “I---” strongly resembles — a common search operator used to find unprotected directories on web servers containing media files. Searching “Index of / Regular Show season 1” might yield third-party servers with MP4s. However, this comes with:
If you're looking to watch full seasons of Regular Show, you're in luck. The show is currently streaming on HBO Max, Amazon Prime Video, and Hulu. You can also purchase individual episodes or seasons on iTunes or Google Play. i--- Regular Show Full Seasons