Fix false positive reports from promq/regexp

[prymitive]

Fixes #782.

[github-actions]

This pull request was validated by pint.

✔️ No problems found

Stats

Stat	Value
Version	v0.49.1-7-gb13f7b9
Number of rules checked	0
Number of problems found	0
Number of offline checks	0
Number of online checks	0
Checks duration	0

Problems

No problems reported

[codecov-commenter]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (8e456d8) 94.15% compared to head (b13f7b9) 94.11%.

Files	Patch %	Lines
internal/checks/promql_regexp.go	37.50%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #783      +/-   ##
==========================================
- Coverage   94.15%   94.11%   -0.05%     
==========================================
  Files          91       91              
  Lines        9519     9526       +7     
==========================================
+ Hits         8963     8965       +2     
- Misses        419      423       +4     
- Partials      137      138       +1     

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