moodleform_mod addRule client regex type small bug (quotes lost)

I am a very new Moodle fan so apologies if this is not a bug but a misuse (I haven´t read all docs yet ).
The issue is that when I add a rule to a field in a subclass of moodleform_mod I use the syntax:

$mform->addRule('myfield', get_string('myErrorMessageId','myMod'), 'regex', "myRegexpression", 'client');

but the generated javascript code is, supposed myRegExpression is "[0-9]

{0,5}":

var regex = [0-9]{0,5}

;

but, if I am not wrong, it should be:

var regex = '[0-9]{0,5}';

If you take a look at file moodleroot/lib/pear/HTML/QuickForm/Rule/Regex.php , you'll find the following sentence in line 84 (moodle 2.3):

return array(" var regex = " . $regex . ";\n", "{jsVar} != '' && !regex.test({jsVar})");

I guess if it should rather be:

return array(" var regex = '" . $regex . "' ;\n", "{jsVar} != '' && !regex.test({jsVar})");

Notice the opening and closing quote surrounding the value of $regex.