Address book restrictions

[linuxguy2]

Discovered I also need to allow only "A-Za-z0-9 " when customers enter addresses in the address book.
Couldn't find any exact examples and tried several different ways/tests but can't make it work
Thanks,

FILE:
tpl_modules_address_book_details.php

<?php
  if (ACCOUNT_COMPANY == 'true') {
?>
<label class="inputLabel" for="company"><?php echo ENTRY_COMPANY; ?></label>
<?php echo zen_draw_input_field('company', $entry->fields['entry_company'], zen_set_field_length(TABLE_ADDRESS_BOOK, 'entry_company', '40') . ' id="company" placeholder="' . ENTRY_COMPANY_TEXT . '"' . (ACCOUNT_COMPANY == 'true' && (int)ENTRY_COMPANY_MIN_LENGTH != 0 ? ' required' : '')); ?>
<br class="clearBoth" />
<?php
  }
?>

[mc12345678]

While the provided section of code doesn't really deal with the requested sanitization, be sure that whatever sanization is being applied that it is accurate for the scope of use. I.e. If services are offered/allowed for say Germany, would need to be sure that characters such as ö, ü, ß, etc... are permitted or for Latin or French languages characters such as é, ì, ñ, etc... are permitted. I haven't tested out the suggested regex to see that such characters are excluded, but have a feeling that they are...