my $last= $string =~ /.*(PATTERN)/s;
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but

my $last= ( $string =~ /(PATTERN)/g )[-1];
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or (first technique fixed in two different ways)

my $last= $string =~ /.*(PATTERN)/s ? $1 : undef;
# or
my( $last )= $string =~ /.*(PATTERN)/sg;
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