map { /(\d+)/; $1 }
No, that is wrong. If /(\d+)/ doesn't match then $1 will not contain valid data:
$ perl -le'
use Data::Dumper;
my @y = map { /(\d+)/; $1 } qw/ ab123cd ab456cd abcdefg ab789cd /;
print Dumper \@y;
'
$VAR1 = [
'123',
'456',
undef,
'789'
];
Just use:
$ perl -le'
use Data::Dumper;
my @y = map /(\d+)/, qw/ ab123cd ab456cd abcdefg ab789cd /;
print Dumper \@y;
'
$VAR1 = [
'123',
'456',
'789'
];
The regular expression by itself will just do the right thing.
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