[Chapel Merge] Fix sanitizer error in Regex

Branch: refs/heads/master
Revision: 94b89f8
Author: leekillough
Log Message:

Merge pull request #17465 from leekillough/RegexSanitize

Fix sanitizer error in Regex

[ Reviewers: @e-kayrakli ]

Modified Files:
M modules/standard/Regex.chpl

Compare: https://github.com/chapel-lang/chapel/compare/8ab2cd101082...94b89f8dd4f4