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  1. or download this
    $ perl -E 'say join(" ", split /(..)/, "e58c97e4bab0")'
 e5  8c  97  e4  ba  b0

$ perl -E 'say join(" ", split /(..)/, "e58c97e4bab0") =~ s/^\s+|\s+$/
+/r'
e5  8c  97  e4  ba  b0
  2. or download this
    $ perl -E 'my @x = split /(..)/, "1234"; say "|$_|" for @x'
||
...

$ perl -E 'my $x = join "_", split /(..)/, "1234"; say $x'
_12__34
  3. or download this
    $ perl -E 'say join(" ", split /(..)/, "e58c97e4bab0") =~ s/^\s+|\s+$/
+/r =~ y/ / /rs'
e5 8c 97 e4 ba b0