perl模块Data::Dumper应用一例分享

#!/usr/bin/perl
use strict;
use warnings;
use Data::Dumper;
my %hash = (
    'name' => 'zdd',
    'id'   => 1234,
);
print Dumper(%hash); # use reference here to get a better output.   

使用 use re debug　查看正则表达式的匹配过程
#!/usr/bin/perlusestrict;usewarnings;usere'debug';subtest{my$str="123456789";printjoin(":",split/(?=...)/,$str);}test();

perl中的$a和$b介绍
即使打开了strict和warnings选项也无妨，下面代码并无错误和警告。#!/usr/bin/perlusestrict;usewarnings;subtest{$a=1;$b=2;print$a,"n";print$b,"n";}test();1;下面是perl文档中

perl用{}修饰变量名的写法分享
subtest{my$head="abc";my$tail="def";my$full="${head}_${tail}";print$full,"n";}直接写成下面这样，在strict模式下是无法通过的。my$full="$head_$tail";