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my $x = 'abc12345';
my ($y) = $x =~ /(\d+)$/;
my $length = length($y);

my $x = 'abc12345';
my $length = length ($x =~ /(\d+)$/);
# returns 1, the length of the number in the number of elements

my $x = 'abc12345';
my $length = map { length } ($x =~ /(\d+)$/);

my $x = 'abc12345';
my $length = map { length } ($x =~ /(\d+)$/)[0];

my $x = 'abc12345';
my $length = length (($x =~ /(\d+)$/)[0]);
# returns 5