SNOW-977565: Added start and end symbol to match full regex to bypass proxy server.

[sfc-gh-jmartinezramirez]

Description

Added start and end symbol to match string with full regex to bypass proxy server.

Checklist

• Code compiles correctly
• Code is formatted according to Coding Conventions
• Created tests which fail without the change (if possible)
• All tests passing (dotnet test)
• Extended the README / documentation, if necessary
• Provide JIRA issue id (if possible) or GitHub issue id in PR name

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.64%. Comparing base (dfba44e) to head (67b376f).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #899      +/-   ##
==========================================
+ Coverage   84.59%   84.64%   +0.04%     
==========================================
  Files          89       89              
  Lines        9681     9683       +2     
  Branches      915      917       +2     
==========================================
+ Hits         8190     8196       +6     
+ Misses       1262     1259       -3     
+ Partials      229      228       -1     

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