Recently I exposed my deepest thoughts, putting me in a vulnerable position. My motivation was mixed, in partially the act was manipulative, and partially it was expressive. I only regret the manipulative aspect in that it I wish I could've found a better way to do it. I don't regret anything else even though the results were near as bad as I could've imagined. Basically, it resulted in a lot of things that were personal to me being broadcasted to a lot of people with a lot of negative effects.
In the end, I couldn't dispute the rumors, and in a way it was a mirror held up to my face on the equivalent of a very unflattering morning. I laid low for a bit, I used that experience to fix those things I didn't like seeing. People that respected before came back, people who didn't, didn't. And incidentals complimented me on my changes. All within 6 months a 'crawl in a hole and die' experience left me in a better place than if it hadn't happened.
Regret, with a big 'R', is really too passive an activity.