What's the point of regretting? For example, I could regret I didn't leave my previous employer earlier because they just didn't pay me more money eventhough m

What's the point of regretting? For example, I could regret I didn't leave my previous employer earlier because they just didn't pay me more money eventhough my skills and impact had gone way up since starting there. But not leaving that job taught me my own value. And knowing my value has now materialized in the form of lots of appreciation shown by later employers as well as better money and more challenging jobs. In the previous job it did suck to realize I won't be rewarded for my hard work but, in comparison to what followed, that suckage was a bargain price and I'd never waste my time regretting it.