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  1.  $rex = qr/my.STRING/is;
  2.     print $rex;                 # prints (?si-xm:my.STRING)
  3.     s/$rex/foo/;
Success #stdin #stdout 0s 3564KB
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Standard input is empty
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(?^si:my.STRING)
https://ideone.com/P1m7Gl
language:
Perl (perl 5.28.1)
created:
10 years ago
visibility:
public

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