PHP regex for password validation

Posted by Fabio Anselmo on Stack Overflow See other posts from Stack Overflow or by Fabio Anselmo
Published on 2012-07-03T20:55:34Z Indexed on 2012/07/03 21:15 UTC
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I not getting the desired effect from a script. I want the password to contain A-Z, a-z, 0-9, and special chars.

  • A-Z
  • a-z
  • 0-9 > 2
  • special chars > 2
  • string length >= 8

So I want to force the user to use at least 2 digits and at least 2 special chars. Ok my script works but forces me to use the digits or chars back to back. I don't want that. e.g. password testABC55$$ is valid - but i don't want that.

Instead I want test$ABC5#8 to be valid. So basically the digits/special char can be the same or diff -> but must be split up in the string.

PHP CODE:

$uppercase = preg_match('#[A-Z]#', $password);
$lowercase = preg_match('#[a-z]#', $password);
$number    = preg_match('#[0-9]#', $password);
$special   = preg_match('#[\W]{2,}#', $password); 
$length    = strlen($password) >= 8;

if(!$uppercase || !$lowercase || !$number || !$special || !$length) {
  $errorpw = 'Bad Password';

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