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Hi evryone, 

On prestashop 1.7.6, french, i have to made some overide ( or in core)

For link to business soft i need to allow Number in FIRST NAME and LAST NAME.

I find some trick who explain this:

Change Validate.php or change customer .php

I try to remove some characters  validate .php in line 182

  public static function isName($name) 
{
        $validityPattern = Tools::cleanNonUnicodeSupport(
            '/^(?:[^0-9!<>,;?=+()\/\\@#"°*`{}_^$%:¤\[\]|\.。]|[\.。](?:\s|$))*$/u'
        );

 To :

  public static function isName($name)
    {
        $validityPattern = Tools::cleanNonUnicodeSupport(
            '/^*$/u'
        );

But  i still the same I can't creat new user with only number

I try this action:

, as not well Blank screen ...
I have to made a restore a backup...

 Does anyone now solution on prestashop 1.7.6.1?

thx for answer :-)