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  1. or download this
    % perl -Mre=debug -e '/.../'
Freeing REx: `","'
...
Offsets: [4]
        1[1] 2[1] 3[1] 4[0]
Freeing REx: `"..."'
  2. or download this
    % perl -Mre=debug -e '/.{3}/'
Freeing REx: `","'
Compiling REx `.{3}'
...
Offsets: [4]
        2[3] 0[0] 1[1] 5[0]
Freeing REx: `".{3}"'