如何将PHP的eregi更改为preg_match [英] How to change PHP's eregi to preg_match

问题描述

可能重复：

如何将ereg表达式转换为PHP中的preg？

我需要帮助，下面是一个很小的非常基本的正则表达式，有点验证一个电子邮件，我确实意识到它不起作用最大，但是我的需要现在是可以的。 >

它目前使用PHP的 eregi函数，php.net说现在是一个折旧功能，我应该使用 preg_match 用preg_match替换erei不行，有人可以告诉我如何使它工作吗？

  function validate_email（$ email）{
 if（！eregi（^ [[：alnum：]] [a-z0-9 _.-] * @ [a-z0-9 .-] + \。[az] {2,4} $ ，$ email））{
 echo'bad email'; 
} else {
 echo'good email'; 
} 
} 
函数validate_email（$ email）{
 if（！preg_match（^ [[alnum：]] [a-z0-9 _.-] * @ [a-z0-9 .-] + \。[az] {2,4} $，$ email））{
 echo'bad email'; 
} else {
 echo'good email'; 
} 
} 
  

解决方案

Perl风格的正则表达式模式总是需要分隔。字符串中的第一个字符被认为是分隔符，所以这样：

  function validate_email（$ email）{
 if（！preg_match（/ ^ [[：alnum：]] [a-z0-9 _.-] * @ [a-z0-9 .-] + \。[az] {2,4} $ / i，$ email））{
 echo'bad email'; 
} else {
 echo'good email'; 
} 
} 
  

您的初始尝试不起作用的原因是因为正在尝试使用 ^ 作为分隔符，但（显然）发现正则表达式的末尾没有匹配的 ^ 。

Possible Duplicate:
How can I convert ereg expressions to preg in PHP?

I need help, below is a small VERY basic regex to somewhat validate an email, I do realize it does not work the greatest but for my needs it is ok for now.

It currently uses PHP's eregi function which php.net says is now a depreciated function and I should use preg_match instead, simply replacing erei with preg_match does not work, can someone show me how to make it work?

function validate_email($email) {
    if (!eregi("^[[:alnum:]][a-z0-9_.-]*@[a-z0-9.-]+\.[a-z]{2,4}$", $email)) {
        echo 'bad email';
    } else {
        echo 'good email';
    }
}
function validate_email($email) {
    if (!preg_match("^[[:alnum:]][a-z0-9_.-]*@[a-z0-9.-]+\.[a-z]{2,4}$", $email)) {
        echo 'bad email';
    } else {
        echo 'good email';
    }
}

解决方案

Perl-style regex patterns always need to be delimited. The very first character in the string is considered the delimiter, so something like this:

function validate_email($email) {
    if (!preg_match("/^[[:alnum:]][a-z0-9_.-]*@[a-z0-9.-]+\.[a-z]{2,4}$/i", $email)) {
        echo 'bad email';
    } else {
        echo 'good email';
    }
}

The reason your initial attempt didn't work is because it was trying to use ^ as the delimiter character but (obviously) found no matching ^ for the end of the regex.

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