Change the pattern of an input to allow only multidates

I have a field in my form. That field has to accept multidates, for that I am using:

$("#myInput").datepicker({
    format: "dd/mm/yyyy",
    multidate: true,
    templates: {
        rightArrow: '>',
        leftArrow: '<'
    }
});

<input type="text" id="myInput" name="myInput" placeholder="DD/MM/YYYY" class="form-control" autocomplete="off">

It works great, but I would like to prevent the user to input some illegal character with some regex pattern.

I’ve found some alphanumeric examples, but could not find an example for multidate. The idea is accepting numbers [0-9] and the characters "," and "/" only.

I also found this example for a single date, and I tried it but it did not work for multiple dates:

^(0?[1-9]|1[012])[- /.](0?[1-9]|[12][0-9]|3[01])[- /.](19|20)dd$

The accepted format is this: DD/MM/YYYY,DD/MM/YYYY,DD/MM/YYYY

E.g.

23/01/2022,25/01/2022,27/01/2022