如何检查字符串在php中是否至少有一个字母、数字和特殊字符 [英] How to check if string has at least one letter, number and special character in php

问题描述

我目前正在编写一个检查每个字符串内容的小脚本.

I am currently writing a small script that checks the contents of each string.

我想知道 REGEX 是什么来确保字符串具有字母(大写或小写)、数字和特殊字符?

I was wondering what the REGEX would be to make sure that a string has a letter (upper or lower), a digit, and a special character?

这是我目前所知道的(并不多):

Here is what I know so far (whcih isn't much):

if(preg_match('/^[a-zA-Z0-9]+$/i', $string)):

帮助会很棒！

谢谢！

推荐答案

最简单(也可能是最好)的方法是使用 preg_match 进行三个单独的检查:

The easiest (and probably best) way is to do three separate checks with preg_match:

$containsLetter  = preg_match('/[a-zA-Z]/',    $string);
$containsDigit   = preg_match('/\d/',          $string);
$containsSpecial = preg_match('/[^a-zA-Z\d]/', $string);

// $containsAll = $containsLetter && $containsDigit && $containsSpecial

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