Fix regex non-multiline EOL/$ matching strings ending with a new-line

[davidwendt]

Closes #9620

Fixes an edge case described in https://docs.python.org/3/library/re.html#re.MULTILINE
where the '$' EOL regex pattern character (without MULTILINE set) should match at the very end of a string and also just before the end of the string if the end of that string contains a new-line.

[codecov]

Codecov Report

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  Hits                    ?     2130           
  Misses                  ?    17952           
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[vuule]

@gpucibot merge