s#\##g doesn't work. The substitution is incomplete. Tack another # on the end and see what happens:

$_ = '\\##hello world';
s#\##g#;
print;
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You still need to escape the "\" regardless of what seperator you use. The # seperator is useful for "/"

Simon Flack ($code or die)
$,=reverse'"ro_';s,$,\$,;s,$,lc ref sub{},e;$,
=~y'_"' ';eval"die";print $_,lc substr$@,0,3;