perl 自定义包/模块的使用(正则表达式匹配email地址和ip)
1. 正则表达式 email:?=~ /^([0-9a-zA-Z]{3,}|[0-9a-zA-Z]+(-|_)?[0-9a-zA-Z_-]+.?[0-9a-zA-Z]+)@[0-9a-zA-Z]+.[0-9a-zA-Z]+(.w+)?/; ip =~/([0-9]{1,3}.?){4}/; ? . Match any character except a wrap character. w Match "word" character and [_0-9a-zA-Z] W?Match non-word character ?[^_0-9a-zA-Z] s ?Match whitespace character?[ rtnf] S?Match non-whitespace character?[^ rtnf] d ?Match digit character [0-9] D?Match non-digit character?[^0-9] t ?Match tab n?Match newline ^?Match the head $?Match the end * ?Match 0 or more times + ?Match 1 or more times ? ?Match 0 or 1 times {n}?Match exactly n times {n,}?Match at least n times ?{n,m}?Match at least n but not more than m times a|b ?match a or match b 2.自定义包/模块 包和模块的区别: 1.一个包的定义可以跨多个模块,一个模块中也可以有多个包定义; 2.定义模块时模块名必须和文件名一致,包无此要求; 注意:包和模块文件末尾需要加1;(return 1) ? 比如: 定义包名为getip.pm 在包文件里写入package getip; View Code #!/usr/bin/perl -w package packagetest; use strict; sub get_local_ip { chomp(my $ip=`ifconfig eth0|grep -oE '([0-9]{1,3}.?){4}'|head -n 1`); return $ip; } sub check_email { my $temp=$_[0]; if($temp=~/^([0-9a-zA-Z]{3,}|[0-9a-zA-Z]+(-|_)?[0-9a-zA-Z_-]+.?[0-9a-zA-Z]+)@[0-9a-zA-Z]+.[0-9a-zA-Z]+(.w+)?/) { return $temp; } else { return $temp="illegal email address!" } } 1;
3.如何使用 使用自定义包,在perl文件加入 package packagetest;(和包放在同一目录下) 使用函数: 包名::函数名 View Code #!/usr/bin/perl -w require "package.pm"; package packagetest; $localip=&packagetest::get_local_ip; print $localip; print "n"; $mail=&packagetest::check_email('someone_example@cn.com'); print "$mailn"; [root@localhost perl]# more getip.pl #!/usr/bin/perl -w require "package.pm"; package packagetest; $localip=&packagetest::get_local_ip; print $localip; print "n"; $mail=&packagetest::check_email('someone_example@cn.com'); print "$mailn";
总结: 1. perl很开放,正则表达式也很深奥,很多情况perl不报错但是结果是错的。 2.perl模块很多,有些模块依赖别的模块,需要一一安装。 (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |