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To do this you use an acf/validate_value filter.
add_filter('acf/validate_value/name=your_field_name', 'your_validate_function_name', 10, 4);
function your_validate_function_name($valid, $value, $field, $input_name) {
if ($valid !== true) {
return $valid;
}
if (strlen($value) < 8 // < 8 characters
|| preg_match('/^[A-Z]/', $value) // starts with a cap
|| !preg_match('/[A-Z]/, $value) // contains no caps
|| !preg_match('/[0-9]/', $value) // contains no numbers
|| !preg_match('/[0-9a-zA-Z]$/', $value) // ends is something other than a letter or number) {
$valid = 'Value is not valid';
}
return $valid;
}
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