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PHP Password RegEx

Posted on 2006-11-25
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Last Modified: 2010-05-18
Hi,

I'm trying to produce a regex for a password with the following requirements:
Min. 8 characers with at least two digits/numbers

Two or more numbers anywhere in a string...how does that translate to a regex?

(?=.*/d) is at least one number, but I cannot figure out how to do at least two numbers.

Thanks!
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Question by:evco
8 Comments
 
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Assisted Solution

by:ictinus
ictinus earned 100 total points
ID: 18013668


http://www.ultrapico.com/ExpressoDownload.htm

this may or may not work honestly I didn't take time to learn the program but it proclaims itselft to be a regex builder.  hopefully it's usefull to you.  
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Accepted Solution

by:
John Kawakami earned 200 total points
ID: 18013731
You have to use two tests.

/.*\d.*\d.*/  -- tests that there are two digits

and

strlen() test for length

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LVL 29

Assisted Solution

by:TeRReF
TeRReF earned 100 total points
ID: 18013873
How about:

<?php

function checkPasswd($pw) {
        if ((preg_match('/^.*\d+.*\d+.*?$/', $pw, $match)) === 1)
                if (strlen($match[0]) > 7)
                        return true;
        return false;
}

$s = 'pass2word6';
if (checkPasswd($s) === true)
        echo 'Good Password';
else
        echo 'Bad Password';

?>
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Author Comment

by:evco
ID: 18014298
Is it impossible to do the length check within the regex? It would be preferrable that way.
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LVL 16

Assisted Solution

by:HackneyCab
HackneyCab earned 100 total points
ID: 18014708
As far as I know, it's not possible to enforce a length using regex where you have more than one character class, so you are best off using the strlen() function in PHP.

Is there a reason why you don't want to use strlen()?
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Author Comment

by:evco
ID: 18014916
I'm using the PEAR QuickForm class and passing a regex to validate the password field. Obviously, I can work around that and use the strlen() function.

Thanks all, for your help.
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LVL 8

Expert Comment

by:John Kawakami
ID: 18015650
If you can pass two regexs to the validation thing, you can also do this:
/.{8,}/

That will specify that there are 8 chars or more.
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Author Comment

by:evco
ID: 18019621
:) Thanks, jk2001
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