formcheck date DD/MM/YYYY

I have a problem with formcheck and validation of a date in Italian format "DD/MM/YYYY"

during the validation I get the message
'Enter the date in the format "DD/MM/YYYY" '

i use:
Contao 2.11.3
formcheck "2.2.0 stable vers 6"

in the file moo_formcheck.html5 and moo_formcheck.xhtml
change

Code:

---

    regexp : {
                    date: '<?php echo $strDateRegex; ?>',
                    datim: '<?php echo $strDatimRegex ?>',
                    time: '<?php echo $strTimeRegex ?>'
            }

---

to

Code:

---

    regexp : {
                    date: <?php echo $strDateRegex; ?>,
                    datim: <?php echo $strDatimRegex ?>,
                    time: <?php echo $strTimeRegex ?>
            }

---