[原创代码] 【练习-012】实现一行内容分行输出

#!/usr/bin/perl
use strict;
use warnings;
$"="";
my $_='aA1一bB2二cC3三dD4四eE5五fF6六gG7七hH8八iI9九';
my @lower=/[a-z]/g;
my @upper=/[A-Z]/g;
my @num=/[0-9]/g;
my @hz=/[^a-zA-Z0-9]/g;
print "@lower\n@upper\n@num\n@hz\n";
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#!/usr/bin/perl
use strict;
use warnings;

my $string='aA1一bB2二cC3三dD4四eE5五fF6六gG7七hH8八iI9九';
my $lower=$string=~tr/a-z/ /cr;
print "$lower\n";
my $upper=$string=~tr/A-Z/ /cr;
print "$upper\n";
my $digit=$string=~tr/0-9/ /cr;
print "$digit\n";
my $hz=$string=~tr/a-zA-Z0-9//d;
print "$string\n";
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