Ensure pattern of replacePosixSep is a string

[luann112]

Summary

Fix #9526 (comment)

• the pattern of replacePosixSep should be string type

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[drew-gross]

Codecov Report

Merging #9546 into master will not change coverage by %.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #9546   +/-   ##
=======================================
  Coverage   65.04%   65.04%           
=======================================
  Files         286      286           
  Lines       12123    12123           
  Branches     3004     3004           
=======================================
  Hits         7885     7885           
  Misses       3600     3600           
  Partials      638      638           

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[SimenB]

Thank you! Could you add a test as well? An integration test makes sense to me here

[luann112]

Thank you! Could you add a test as well? An integration test makes sense to me here

Sorry for not able to reply back to you sooner. Thanks for your support anyway.

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