I have to remember my mistakes and regret that I did not consider the situation on the other hand, if I do not, I will just continue to make mistakes and lose money.
In my opinion, in order to avoid mistakes in the future, you need not to regret, but to see your mistake and draw conclusions. Regrets will bring you back and you will experience negative emotions every time, because regret is a negative emotion. But a sober look at the situation will help to properly assess it and in the future to adjust its actions to achieve the best result.