Is this the entire context? On reading this, I would think "In this case, I wanted to do it enough that I would have regretted not doing it" would sound more complete. This way, it means that the person acknowledges they really wanted to do the action. If they didn't do it, they would regret it. Therefore, they used it as an excuse to justify doing the action. i.e: "When I was on vacation I got the chance to sky-dive. Although it was scary at first, I wanted to do it enough that I would have regretted not going. So, I decided to jump".

The sentence is not correct. I'm not even sure what is trying to be said. I think it should be "I wanted to do all I can, so I wouldn't regret it"