[英]Regular Expression for a password with at least 8 characters and at least 1 non-alphanumeric character(s)
I am trying to make a check in PHP if a user changes their password their new password must be 8 or more characters and with at least 1 non-alphanumeric password. 我试图在PHP中进行检查,如果用户更改了他们的密码,他们的新密码必须是8个或更多字符,并且至少有1个非字母数字密码。 How should I check this and what would the regex be? 我该怎么检查这个以及正则表达式是什么?
Checking the length is the easy part strlen >= 8
. 检查长度是容易的部分strlen >= 8
。 My problem is regular expressions. 我的问题是正则表达式。 I really have no clue about regular expressions even after years of studying computer science. 即使经过多年的计算机科学研究,我对正则表达式也一无所知。
Thanks 谢谢
Try something like this to check if they used non-alphanumeric characters: 尝试这样的方法来检查它们是否使用了非字母数字字符:
if( !preg_match( '/[^A-Za-z0-9]+/', $password) || strlen( $password) < 8)
{
echo "Invalid password!";
}
The if
statement will evaluate to true
if the $password
does not contain at least one of the characters not in the list (alphanumeric characters). if
$password
不包含列表中不包含的至少一个字符(字母数字字符), if
语句将评估为true
。
This should work (untested) 这应该工作(未经测试)
if (preg_match('/^(?=.*[\W])(?=[a-z0-9])[\w\W]{8,}$/i', '123abc!$'))
{
//error
}
It makes sure the password is 8 characters long and has at least one special character 它确保密码长度为8个字符,并且至少包含一个特殊字符
If you're checking the string length with strlen/mb_strlen, you can simply write a regular expression to match any non-alphanumeric character. 如果使用strlen / mb_strlen检查字符串长度,则只需编写正则表达式即可匹配任何非字母数字字符。 If it matches one (or more), you're good. 如果它匹配一个(或更多),你就是好的。 For example: 例如:
$password = 'asdf123!';
if(mb_strlen($password) >= 8 and preg_match('/[^0-9A-Za-z]/', $password))
{
// password is valid
}
To my knowledge, you can't achieve this because it's a composite condition scenario. 据我所知,你无法实现这一点,因为它是一个复合条件场景。
What you'd need to do is do it in a three step fashion: 你需要做的是以三步的方式做到这一点:
$has8characters = (mb_strlen($_REQUEST['password']) >= 8);
$hasAlphaNum = preg_match('b[a-z0-9]+bi', $_REQUEST['password']);
$hasNonAlphaNum = preg_match('b[\!\@#$%\?&\*\(\)_\-\+=]+bi', $_REQUEST['password']);
This wasn't tested, but you are pretty close of what you want to achieve with this... 这没有经过测试,但你已经非常接近你希望通过这个...
Good luck 祝好运
Try this. 试试这个。
~^(.*[\W]+.*){8,}$~
This solves it. 这解决了它。 Have a try! 试试!
if(!preg_match('/^(?=.*\d)(?=.*[A-Za-z])[0-9A-Za-z!@#$%]{8,}$/', $pass)) {
echo "Password does not meet the requirements! It must be alphanumeric and atleast 8 characters long";
}
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