My definitions produce a slightly different result. I assume that "sentence" is the string and "last word" is the last string of 'word' characters. The "rest" is all the characters before the "last word". Note that the space before "last word" is included in 'rest'. Possible non-word characters after "Last word" are discarded.
my $list = "This is my list";
$list =~ /
^(.+) # The 'rest' (Everything before last word)
\b # UPDATE (ref [eyespoplikeamosquito] below)
(\w+) # Last 'word' (string of contiguous word characters)
\W*$ # Possible non-word characters at end of string
my $last = $2;
my $the_rest = $1;
print $the_rest; # "This is my"
print $last; # "list";
This is my list
UPDATE: Added explicit definition of 'sentence'.
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