Change the 5th occurrence of whoever/whomever in $_ to whosoever/whomsoever. Here's a little more detail in a slight rewrite:
my $count=0;
$_ =~ s/ ((whom?)ever) # whom? is in $2, whom?ever is in $1
/ if ( ++$count == 5 ) # for the fifth match
{
"${2}soever"; # set to whom?soever
}
else
{
$1; # leave it as it is
}
/igex; # case (i)nsensitive, (g)lobal match, (e)xecute replace
+string.
# (x) ignore whitespace (added for this code example)
ps - I hope your tutor reads Perlmonks :)
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