[Zope-dev] regex vs. re

Why do DocumentTemplates and ZPublisher use regex instead of re? Since re is thread-safe and regex isn't, wouldn't it make sense to move things in the 're' direction? Or is Python 1.4 still being supported for these packages? One reason I ask is that I'm about to begin using regular expression in ZPublished code, and I'm wondering whether there's some special reason I should use regex instead of re. (Aside from the fact that it would mean not loading two different regular expression libraries, of course. :) )