The meaning of {regrets} and {Oh, the regret for the servants}?

Question:
The saying of Allah (Glorified and Exalted is He) : [Fatir:8] and the saying of Allah (Blessed and Exalted is He): [Ya-Sin:30] What is the meaning of these verses?

Answer:
Regrets for them in the Fire, meaning, every sinner will regret on the Day of Resurrection and wish that he had obeyed Allah, but it will not benefit him. Every sinner on the Day of Resurrection will regret and wish that he had obeyed Allah and that he had not obeyed Satan.
Q: [Ya-Sin:30]?
A: Intense regret, meaning, an intense regret that befalls them because of their disbelief.
Q: In this world and the Hereafter, or in the Hereafter only?
A: It is most intense in the Hereafter, at the time of the soul's departure, and in the grave. As for in this world, it is in heedlessness and forgetfulness. We ask Allah for well-being.