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  1. or download this
    >perl -Mre=debug -e"/$_/ for qw( foo bar bar foo )" 2>&1 | find "Compi
+ling"
Compiling REx `foo'
...
Compiling REx `foo'
Compiling REx `bar'
Compiling REx `foo'
  2. or download this
    >perl -Mre=debug -e"$re=qr/foo/; /$re/" 2>&1 | find "Compiling"
Compiling REx `foo'
...
>perl -Mre=debug -e"$re=qr/foo/; /a$re/" 2>&1 | find "Compiling"
Compiling REx `foo'
Compiling REx `a(?-xism:foo)'