Comments (2)
They are really the same ... the first has no capture groups and the second has two .... If the backreferences in the second are not being used then they could be dropped.
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As Spuds said, the one from Register.php should be used since there are no backreferences being used:
// No funky symbols either.
if (preg_match('~[<>&"\'=\\\]~', preg_replace('~(&#(\\d{1,7}|x[0-9a-fA-F]{1,6});)~', '', $_POST['user'])) != 0)
{
$context['login_errors'] = array($txt['error_invalid_characters_username']);
return;
}
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