perl5中\z和\Z匹配字符串结尾的差异是什么

Question

我在使用\z和\Z匹配的时候没发现差异，各位能不能帮忙解释一下，下面是代码：
#!/usr/bin/perl
use 5.010;
use strict;
use warnings;

    $_ = "This is a wilma line barney is on another line
    but this ends in fred and a final dino lines";
            if(/line\Z/){
                            print "it mathed\n";
                    }else{
    print "it doesn't match!\n"
    }

结果显示没有匹配，\Z不是匹配行末尾吗，后面可以有换行的，为什么没匹配上第一行末尾呢？

Answer 1

参考：　http://stackoverflow.com/questions/2707870/whats-the-difference-between-z-and-z-in-a-regular-expression-and-when-and-how