CODEWITHSUNDEEP
preg-replacepreg-match
user3013620
user3013620

Reputation: 3

Allow only a-Z, 0-9 using preg_match, preg_replace

Could somebody please help out with this line? How to modify it so it only allows a-Z, 0-9? Thanks.

    if (preg_match('~[<>&"\'=\\\]~', preg_replace('~&#(?:\\d{1,7}|x[0-9a-fA-F]{1,6});~', '', $context['checked_username'])) != 0 || $context['checked_username'] == '_' || $context['checked_username'] == '|' || strpos($context['checked_username'], '[code') !== false || strpos($context['checked_username'], '[/code') !== false)
            $context['valid_username'] = false;

Upvotes: 0

Views: 362

Answers (1)

Jason Heo
Jason Heo

Reputation: 10246

following code checks [[:alnum:]] (alnum stands for alpha numeric)

if (!preg_match("/^[[:alnum:]]+$/", $context['checked_username']))
{
    $context['valid_username'] = false;
}

Upvotes: 0

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