Fix static check warning: not calling regexp.Match in a loop

[haoxins]

calling regexp.Match in a loop has poor performance, consider using regexp.Compile

What type of PR is this?

• bug
• feature
• enhancement

What problem(s) does this PR solve?

Issue(s) number:

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 64.87%. Comparing base (7953667) to head (294cdb3).

Files	Patch %	Lines
result_set.go	0.00%	4 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #324      +/-   ##
==========================================
- Coverage   64.94%   64.87%   -0.07%     
==========================================
  Files          11       11              
  Lines        2784     2787       +3     
==========================================
  Hits         1808     1808              
- Misses        825      828       +3     
  Partials      151      151              

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