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    Win8 Strawberry 5.8.9.5 (32)  Thu 04/15/2021  1:56:15
C:\@Work\Perl\monks
...
qr matches: x.txt .txt x.png .png x.TxT .tXt x.pNg .PnG
ok 1 - qr// vs q//
ok 2 - no warnings
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    Win8 Strawberry 5.8.9.5 (32)  Thu 04/15/2021  2:32:48
C:\@Work\Perl\monks
...
^Z
(?-xism:foo) match: 'foofoofoo'
'foo' match: 'foo'