src/Service/Config/Security.php
protected function evalDevHandle($value, $name)
    {
        $result = preg_match('/[^a-zA-Z]/', $value) === 0;
        if ($result === false) {
            $this->pool->messages->addMessage(static::KEY_CONFIG_ERROR . ucfirst($name));
        }

        return $result;
    }
protected function evalDevHandle($value, $name)
    {
        $result = preg_match('/[^a-zA-Z]/', $value) === 0;
        if ($result === false) {
            $this->pool->messages->addMessage(static::KEY_CONFIG_ERROR . ucfirst($name));
        }

        return $result;
    }
protected function evalDevHandle ( $ value , $ name ) { $ result = preg_match ( '/[^a-zA-Z]/' , $ value ) === 0 ; if ( $ result === false ) { $ this -> pool -> messages -> addMessage ( static :: KEY_CONFIG_ERROR . ucfirst ( $ name ) ) ; } return $ result ; }
We check the dev handle for a-z and A-Z.

@param string $value
The value we want to evaluate
@param string $name
The name of the value we are checking, needed for the feedback text.

@return boolean
Whether it does evaluate or not.
We check the dev handle for a - z and A - Z .