[Chapel Merge] Resolve a test that started breaking on case-insen

Branch: refs/heads/main
Revision: 96c9220
Author: bradcray
Link: Unavailable
Log Message:

Merge pull request #18823 from bradcray/fix-regex-case-sensitivity

Resolve a test that started breaking on case-insensitive platforms

[trivial and reviewed by @lydia-duncan]

Lydia pointed out in issue #18821 that when we renamed Regexp.chpl to
Regex.chpl, tests in this directory that had been doing 'use Regexp;'
were updated to 'use Regex;' which was disambiguated to the test named
'regex.chpl' in this directory. Here, I'm just renaming the test to
regexp.chpl to avoid the ambiguity.

Resolves #18821

Modified Files:
A test/regex/ferguson/regexp.chpl

A test/regex/ferguson/regexp.compopts
A test/regex/ferguson/regexp.good
R test/regex/ferguson/regex.chpl
R test/regex/ferguson/regex.compopts
R test/regex/ferguson/regex.good
M test/regex/ferguson/regex-no-leak.chpl

Compare: https://github.com/chapel-lang/chapel/compare/bd246cc25972...96c92203603f