fix(glpiselectfield): comparison with regex

Author: btry

inc/field/glpiselectfield.class.php

@@ -243,10 +243,6 @@ public function lessThan($value): bool {
       return !$this->greaterThan($value) && !$this->equals($value);
    }
 
-   public function regex($value): bool {
-      return (preg_grep($value, $this->value)) ? true : false;
-   }
-
    public function isAnonymousFormCompatible(): bool {
       return false;
    }