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  1. or download this
    $ perl -Mre=debug -e " $f = qr/./; warn if m/$f/"
Compiling REx "."
Final program:
...
minlen 1
Freeing REx: "."
  2. or download this
    $ perl -Mre=debug -e " $f = qr/./; $g = qr/./; $c=qr/$f$g/; "
Compiling REx "."
...
Freeing REx: "."
Freeing REx: "(?-xism:.)(?-xism:.)"