Fix issue with ydktest-sanity regex

[ghost]

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[codecov-io]

Codecov Report

Merging #473 into master will decrease coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #473      +/-   ##
==========================================
- Coverage   84.07%   84.01%   -0.07%     
==========================================
  Files         109      109              
  Lines       13050    13050              
  Branches     1885     1885              
==========================================
- Hits        10972    10964       -8     
- Misses       1561     1566       +5     
- Partials      517      520       +3

Impacted Files	Coverage Δ
ydkgen/builder/test_case/test_cases_builder.py	79.85% <0%> (-2.16%)	⬇️
ydkgen/builder/test_case/test_value_builder.py	92.05% <0%> (-0.84%)	⬇️
...cases/python/expected/ydk/models/ydktest_sanity.py	74.67% <0%> (ø)	⬆️

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