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use strict;
use warnings;
...
my $the_rest = $1;
print "the_rest='$the_rest'\n";
print "last='$last'\n";

the_rest='This is my lis'
last='t'

$list =~ /
    ^(.+)    # The 'rest' (Everything before last word)
    \b(\w+)  # Last 'word' (string of contiguous word characters)
    \W*$     # Possible non-word characters at end of string
/x;