How to use regex to replace domain name in php

How to implement regular domain name replacement in php: first get the URL of the website; then create a regular expression as "$reg = '/(http):\/\/([^\/] )/i' ;"; then replace the specified domain name; and finally run the relevant PHP file.

Recommended: "PHP Video Tutorial"

The domain name in the URL extracted by regular rules and the method of replacing the domain name preg_match () and preg_replace()

 string 'http://www.baidu.com' (length=20)
=> string 'http' (length=4)
=> string 'www.baidu.com' (length=13)
    */
    //要替换的位置替换成什么
    $url1 = 'www.jingdong.com';
 
    /**
    Example #1 使用后向引用紧跟数值原文
    */
    echo preg_replace($reg, 'http://'.$url1, $url);
 
        
    /**
    Example #2 preg_replace()中使用基于索引的数组
    */
    $patterns[0] = '/'.$res[2].'/';
    $replacements[0] = $url1;
    echo preg_replace($patterns, $replacements, $url);
    //结果为 http://www.jingdong.com/index.php
 
 
 
 ?>

The above is the detailed content of How to use regex to replace domain name in php. For more information, please follow other related articles on the PHP Chinese website!