It's better to avoid the ? modifier in most cases, as it's less efficient as alternatives. Here's a benchmark:
#!/usr/bin/perl
use strict;
use warnings;
use Benchmark 'cmpthese';
use Test::More tests => 2;
our @data = qw 'foo123 abdbdr23 abcd2 abc 1234 foo!123';
our (@plain, @sticky);
my @expected = ([qw 'foo 123'], [qw 'abdbdr 23'], [qw 'abcd 2'],
['abc', ''], ['', 1234], []);
cmpthese -1, {
plain => '@plain = map {[/^([a-z]*)(\d*)$/]} @data',
sticky => '@sticky = map {[/^(\w*?)(\d*)$/]} @data',
};
is_deeply \@plain, \@expected;
is_deeply \@sticky, \@expected;
__END__
1..2
Rate sticky plain
sticky 32582/s -- -17%
plain 39385/s 21% --
ok 1
ok 2
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