julia

aa342bc3 - Lift expensive Regex construction from DateFormat method body.

Lift expensive Regex construction from DateFormat method body. Constructing the Regex touched in this commit can represent a significant fraction (e.g. half or better) of the runtime of the DateFormat method touched in this commit. To make this DateFormat method more efficient, let's lift that Regex construction out of that method body. (cherry picked from commit 7fb5bb8a9a4f05bfcad6a47370ce3507d632f9f6)