fix: serialize regexpes properly in the server-side config

[rchl]

Fixes #307

[codecov]

Codecov Report

Merging #308 (0421488) into master (9ac16b4) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #308   +/-   ##
=======================================
  Coverage   55.55%   55.55%           
=======================================
  Files           1        1           
  Lines          27       27           
  Branches        8        8           
=======================================
  Hits           15       15           
  Misses          9        9           
  Partials        3        3           

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