Fix #13 - Regex checks fail in 2.7

[lmazuel]

No description provided.

[codecov-io]

Codecov Report

Merging #14 into master will not impact coverage.

@@           Coverage Diff           @@
##           master      #14   +/-   ##
=======================================
  Coverage   70.28%   70.28%           
=======================================
  Files           9        9           
  Lines        1198     1198           
=======================================
  Hits          842      842           
  Misses        356      356

Impacted Files	Coverage Δ
msrest/serialization.py	66.22% <ø> (ø)	✅

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