Benchmark confirms:
use strict;
use Benchmark;
my $results = timethese( 1e6,
{
repeat => sub{
my $t1 = '20090123';
$t1 =~ /(\d\d\d\d)(\d\d)(\d\d)/;
my ($y1,$m1,$d1) = ($1,$2,$3);
},
range => sub{
my $t2 = '20090123';
$t2 =~ /(\d{4})(\d{2})(\d{2})/;
my ($y2,$m2,$d2) = ($1,$2,$3);
},
} );
my $results2 = timethese( 1e6,
{
range2 => sub{
my $t3 = '20090123';
$t3 =~ /(\d{4})(\d{2})(\d{2})/;
my ($y3,$m3,$d3) = ($1,$2,$3);
},
repeat2 => sub{
my $t4 = '20090123';
$t4 =~ /(\d\d\d\d)(\d\d)(\d\d)/;
my ($y4,$m4,$d4) = ($1,$2,$3);
},
}
);
__END__
Benchmark: timing 1000000 iterations of range, repeat...
range: 2 wallclock secs ( 1.69 usr + 0.00 sys = 1.69 CPU) @ 59
+2417.06/s (n=1000000)
repeat: 2 wallclock secs ( 1.53 usr + 0.00 sys = 1.53 CPU) @ 65
+3167.86/s (n=1000000)
Benchmark: timing 1000000 iterations of range2, repeat2...
range2: 2 wallclock secs ( 1.70 usr + 0.00 sys = 1.70 CPU) @ 58
+6854.46/s (n=1000000)
repeat2: 0 wallclock secs ( 1.53 usr + 0.00 sys = 1.53 CPU) @ 65
+3167.86/s (n=1000000)
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