Fix unmatched (: /(?:\d{2}|�){2,}/ exception when requireing the file.

[marc-cizeron]

When this file is required, i get unmatched (: /(?:\d{2}|�){2,}/ exception. Adding '\' before use of FNC1 constant to escape properly.

We are using ruby 1.8.7 (i know, it's old), and Rails 1.6.2 (I know too) under Ubuntu 20.04. I don't know if other have this issue with newer version of ruby/rails. But in our case, that's solve the issue.