Messages

Hi,
I think the best solution to searching in the Abantecart is ElasticSearch Extension https://marketplace.abantecart.com/elastic_search

For default search you should add hook to enable search by model.

You can change tpl (for custom JS validation) or create extension with hook's to add php validation.

Verify start after click on "Add to Cart"
On typing used html attribute 'pattern'
<input type="text" name="option[354]" id="option354" value="" placeholder="" class="form-control " data-attribute-value-id="" pattern="^.{1,100}$" title="Some error text">

I try your regex - they work fine.
Provide more information: Abantecart Version, browsers for test, have you errors in browser console? errors in abantecart log or php? etc.

Login on your Router and check firewall rules and black list (if exists)
Some routers can block sites by keyword from own library.

Best way - create extension with hook's in Storefront Category controller.
To prevent direct access to product you need hooks:
Storefront Product controller, Storefront Search controller, Block controllers (if used)

Doc: https://abantecart.atlassian.net/wiki/spaces/DOC/pages/17793156/Hooks

1. Clear cache.
2. If Step1 not solved your issue -   Show result of query

SELECT DISTINCT table_name
                FROM information_schema.columns
                WHERE column_name = 'language_id' AND table_schema='DB_DATABASE';

Where DB_DATABASE - your DB name

You can create extension with Hook method like this:

public function onModelAccountCustomer_ValidateData()
{
$that = $this->baseObject;
if ($this->baseObject_method !== 'validateRegistrationData') {
            return;
  }
if (!$that->request->is_POST()) {
return;
}
if ((mb_strlen($that->request->post['postcode']) !=5)) {
            $that->error['postcode'] = $that->language->get('error_postcode');   //Your custom error message here
     }
}

Hello,
You can use https://github.com/laracasts/PHP-Vars-To-Js-Transformer
or any i18n for JS solution.

You can check exists orders in Cart Controller Hook: storefront/controller/pages/checkout/cart.php:26
for check email registration create hook for Registartion Controller: storefront/controller/pages/account/create.php:24

Check Database Connection settings

You can hook ControllerCommonListingGrid via extension and change: $this->data[''colNames'']  $this->data[''colModel'']

Provide more details in which file made changes in which place, what information in the logs. Check if your code is running

Check file permissions

check your my.cnf parameter default-storage-engine

https://dev.mysql.com/doc/refman/5.5/en/storage-engines.html