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@ 2016-02-15T10:22:13Z

<?php

$values = array(
    'barry',
    'barry1',
    'Barry1',
    'Barry1!',
    'barry1!@',
);
    
function validate($value)
{
    return preg_match('/^.*(?=.{4,})(?=.*[a-zA-Z])(?=.*[0-9])(?=.*[\d\X])(?=.*[!$#%]).*$/', $value);
}

foreach ($values as $value)
{
    var_dump(validate($value));
}

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
preg_match: documentation ( source)

preferences:dark modelive previewkey bindings

26.4 ms | 405 KiB | 5 Q