Move re.compile out of functions

Moving re.compile out of functions has the potential to speed up re-intensive functions (although re.compile does cache results on its own).

Closes: #971960

debian/changelog

+python-debian (0.1.39) UNRELEASED; urgency=medium
+
+  * Move re.compile calls out of functions (Closes: #971960).
+
+ -- Stuart Prescott <stuart@debian.org>  Sun, 11 Oct 2020 14:21:54 +1100
+
 python-debian (0.1.38) unstable; urgency=medium
 
   [ Jelmer Vernooij ]