I'd like to suggest turning pcre on by default for shells/zsh. This lets users use plugins like https://github.com/sunlei/zsh-ssh without recompiling zsh. A counter argument is that zsh's PCRE support uses the old, deprecated V1 library. However, the next release of zsh should move to v2 as that code is already committed. I have no idea when that release will be. So if not now, maybe on the next release? I'm quite open to other counter-arguments. Just wanted to start a discussion. Also happy to contribute a patch if this is acceptable. Thanks!