by

there's two possibilities of regrets:

1. regrets of not having enough consideration before taking a decision
2. regrets of having too much consideration and not taking chances

it's about either being too hurry or being too draggy,
or about not being patient enough or hesitating too much for a 'yes',
but that's called mistakes, and however painful it may be, there's always a lesson to take.

it's not wrong to make mistakes.