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  1. or download this
    perl -le '$re = "(hello)"; $_ = "Hello world";  print $1 if /$re/i;'
  2. or download this
    perl -le '$re = qr/(hello)/; $_ = "Hello world";  print $1 if /$re/i;'
  3. or download this
    perl -le '$re = qr/(hello)/i; $_ = "Hello world";  print $1 if /$re/;'