功能：

1.获取内容中的url，email，image。

2.替换内容中的url，email，image。

url：<a href="url">xxx</a>

email：admin@admin.com

image：<img src="image">

Grep.class.php

/** grep class * Date: 2013-06-15 * Author: fdipzone * Ver: 1.0 * * Func: * site: www.jbxue.com* set: 设置内容 * get: 返回指定的内容 * replace: 返回替换后的内容 * get_pattern 根据type返回pattern */class Grep{ // class startprivate $_pattern = array( 'url' => '/<a.*?href="((http(s)?:\/\/).*?)".*?/si', 'email' => '/([\w\-\.]+@[\w\-\.]+(\.\w+))/', 'image' => '/<img.*?src=\"(http:\/\/.+\.(jpg|jpeg|gif|bmp|png))\">/i' );private $_content = ''; // 源内容/* 設置搜尋的內容 * @param String $content */ public function set($content=''){ $this->_content = $content; }/* 获取指定内容 * @param String $type * @param int $unique 0:all 1:unique * @return Array */ public function get($type='', $unique=0){$type = strtolower($type);if($this->_content=='' || !in_array($type, array_keys($this->_pattern))){ return array(); }$pattern = $this->get_pattern($type); // 获取patternpreg_match_all($pattern, $this->_content, $matches);return isset($matches[1])? ( $unique==0? $matches[1] : array_unique($matches[1]) ) : array();}/* 获取替换后的内容 * @param String $type * @param String $callback * @return String */ public function replace($type='', $callback=''){$type = strtolower($type);if($this->_content=='' || !in_array($type, array_keys($this->_pattern)) || $callback==''){ return $this->_content; }$pattern = $this->get_pattern($type);return preg_replace_callback($pattern, $callback, $this->_content);}/* 根据type获取pattern * @param String $type * @return String */ private function get_pattern($type){ return $this->_pattern[$type]; } } // class end?>

演示示例：

header('content-type:text/htm;charset=utf8');require('Grep.class.php');$content = file_get_contents('http://www.jbxue.com/');$obj = new Grep(); $obj->set($content);$url = $obj->get('url', 0); $email = $obj->get('email', 1); $image = $obj->get('image', 1);print_r($url); print_r($email); print_r($image);$url_new = $obj->replace('url', 'replace_url'); echo $url_new;function replace_url($matches){ return isset($matches[1])? '[url]'.$matches[1].'[/url]' : ''; } ?>