prevent these kinds of symbols "~!@#$%^&*()_+" input

[ericho09]

Can I prevent any symbols input and only allow letter and number?

How to set value not contain any symbols for codes below?

function my_custom_validator($valid, $value, $element)
{
if ($value != ‘Foo’) {
$element->addError(‘The value is not Foo’);
$valid = false;
}

return $valid;
}
add_filter(‘iphorm_element_valid_iphorm_1_1’, ‘my_custom_validator’, 10, 3);

Thank you

[Ally]

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