[RegEx]

It might not just be you working. Sure, use things that you understand. The problem comes when you aren't even aware you don't understand due to subtleties you may have not encountered yet. Then you do some debugging, do some googling, and bam, now it's "obvious to anyone with half a brain, everyone should just RTFM"

[nsmartt]

I understand the potential harm when working with teams, but I also recognize that it's a shame to limit your use of the language to avoid potential trouble. Surely there's some middle ground to be found over dogma such as Never use <feature>.

I'm not suggesting that everyone should understand every detail of every potentially misunderstood feature. I'm suggesting that these situations should be dealt with on a case-by-case basis.