I ran into this post by Michael T. Richter a while ago and found it to be an interesting read. I certainly recall the regex question he’s talking about and I remember stumbling upon that question myself back in the day. In the past StackOverflow did seem more like a community of developers who wanted to have fun and help eachother out. The dude makes some good points in his (now old and deleted) post.
However it has been archived and so I link to the archive here, mainly for my own future reference.