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  1. or download this
      DB<3> $r="abc|xyz";

...

  DB<5> p $rx
(?^u:abc|xyz)
  2. or download this
      DB<6> $rx=qr(/$r/i);   # strike it, see update

  DB<7> p $rx
(?^u:/abc|xyz/i)
  3. or download this
      DB<27> $rx = qr($r)i;    # or traditionally qr/$r/i

...
(?^ui:abc|xyz)
  DB<29> p "XYZ" =~ $rx
1