本章介绍正则表达式。
先看看data_valid_fns.php的代码吧。
1 php
2
3 function filled_out( $form_vars )
4 {
5 // test that each variable has a value
6 foreach ( $form_vars as $key => $value )
7 {
8 if ( ! isset ( $key ) || ( $value == '' ))
9 return false ;
10 }
11 return true ;
12 }
13
14 function valid_email( $address )
15 {
16 // check an email address is possibly valid
17 if ( ereg ( ' ^[a-zA-Z0-9_\.\-]+@[a-zA-Z0-9\-]+\.[a-zA-Z0-9\-\.]+$ ' , $address ))
18 return true ;
19 else
20 return false ;
21 }
22
23 ?>
24
filled_out( $form_vars )验证输入的有效性。
valid_email ( $address ) 验证email的有效性。它是通过正则表达式进行的。
本章具体介绍正则表达式。
PHP支持POSIX扩展的正则表达式,也支持使用Perl语法兼容的正则表达式。
如果你对正则表达式不是很清楚的话,请参见正则表达式的语法。
下面我们分别介绍以下这2种格式的正则表达式
1 POSIX正则表达式函数
为了使用此功能,你首先要配置PHP,使之支持它。在Windows下安装的话,它会自动配置。但是在其他操作系统下,需要手工配置。
要激活 regexp 的支持,请在配置 PHP 时加上 --with-regex[=TYPE]。TYPE 可以是 system,apache 或 php 之一。默认使用 php。
支持的函数有:
ereg_replace -- 正则表达式替换 ereg -- 正则表达式匹配 eregi_replace -- 不区分大小写的正则表达式替换 eregi -- 不区分大小写的正则表达式匹配 split -- 用正则表达式将字符串分割到数组中 spliti -- 用正则表达式不区分大小写将字符串分割到数组中 sql_regcase -- 产生用于不区分大小的匹配的正则表达式
2 Perl兼容正则表达式函数
preg_grep -- 返回与模式匹配的数组单元 preg_match_all -- 进行全局正则表达式匹配 preg_match -- 进行正则表达式匹配 preg_quote -- 转义正则表达式字符 preg_replace_callback -- 用回调函数执行正则表达式的搜索和替换 preg_replace -- 执行正则表达式的搜索和替换 preg_split -- 用正则表达式分割字符串

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