public Connection::escapeAlias($field)
Escapes an alias name string.
Force all alias names to be strictly alphanumeric-plus-underscore. In contrast to DatabaseConnection::escapeField() / DatabaseConnection::escapeTable(), this doesn't allow the period (".") because that is not allowed in aliases.
string $field: An unsanitized alias name.
string The sanitized alias name.
public function escapeAlias($field) { return preg_replace('/[^A-Za-z0-9_]+/', '', $field); }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Database!Connection.php/function/Connection::escapeAlias/8.1.x