Fix _regexp_paths_csv_validator
for already validated values
#5439
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doc/whatsnew/<current release.rst>
.Type of Changes
Description
Closes #5437
I have not done anything to the error. The error is actually based on a pattern we have made, but should never be encountered by users. Since this is also related to
optparse
I don't think it is worth the effort to improve the error code and handling of it for now.