what is regret in irctc

In the context of IRCTC, "regret" refers to a status that appears when the reservation system cannot accept new booking requests for a train because it has exceeded the waitlist capacity for that train. This means that no booking is allowed at any time, and further booking is not allowed. Therefore, if a train is showing a regret status, it is not possible to get confirmed tickets in any quota, including tatkal quota.