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  1. or download this
    bester:~> perl -Mstrict -Mwarnings -le 'print "defined!" if defined( (
+split /\//, "2|3|||||")[4]);'
bester:~>
  2. or download this
    bester:~> perl -Mstrict -Mwarnings -le 'print "defined!" if defined( (
+map { defined($_) ? $_ : ""; } (split /\//, "2|3|||||") )[4]);'
bester:~>