Check string for consecutive alpha numerics

[artie2004]

Hi. I need to check that a password does not contain consecutive alpha numerics. i.e., abbcdef
Could someone tell me how to do this? Thanks.

[dreamcatcher]

You can use the strstr function to check the occurence of something in a string.

$string = 'abbcdef';

if (strstr($string,'bb'))
{
//error
}

dc

[coopster]

You could use a regular expression, too.

$subject = 'abbcdeeeeeefgh'; 
print "$subject<br />\n"; 
$pattern = '/(\w)\1+/'; 
$subject = preg_replace($pattern, "$1", $subject); 
print "$subject<br />\n";