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: =~ /^({3,}|+(-|_)?+\.?+)\@+\.+(\.\w+)?/;
ip =~/({1,3}\.?){4}/;
. Match any character except a wrap character.
\w Match "word" character and
\W Match non-word character[^_0-9a-zA-Z]
\sMatch whitespace character [ \r\t\n\f]
\S Match non-whitespace character [^ \r\t\n\f]
\dMatch digit character
\D Match non-digit character [^0-9]
\tMatch 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|bmatch 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
1 #!/usr/bin/perl -w
2 package packagetest;
3 use strict;
4 sub get_local_ip
5 {
6 chomp(my $ip=`ifconfig eth0|grep -oE '({1,3}\\.?){4}'|head -n 1`);
7 return $ip;
8 }
9 sub check_email
10 {
11 my $temp=$_;
12 if($temp=~/^({3,}|+(-|_)?+\.?+)\@+\.+(\.\w+)?/)
13 {
14 return $temp;
15 }
16 else
17 {
18 return $temp="illegal email address!"
19 }
20 }
21 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
1 #!/usr/bin/perl -w
2 require "package.pm";
3 package packagetest;
4 $localip=&packagetest::get_local_ip;
5 print $localip;
6 print "\n";
7 $mail=&packagetest::check_email('someone_example@cn.com');
8 print "$mail\n";
9 # more getip.pl
10 #!/usr/bin/perl -w
11 require "package.pm";
12 package packagetest;
13 $localip=&packagetest::get_local_ip;
14 print $localip;
15 print "\n";
16 $mail=&packagetest::check_email('someone_example@cn.com');
17 print "$mail\n";
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。
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