How To I Do Use Regex For Dd/Mm/Yyyy

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jQuery

I have try this but no use.Kindly help
Syntax Error in Regular Expression.

/^[1-9]|1[0-9]|2[0-9]|3[0-1][/ . -][1-9]|0[1-9]|1[0-2][/ . -]1[8][0-9][0-9]|2[0][0-9][0-9]*$/;

/^(0[1-9]|[12][0-9]|3[01])[/ . -](0[1-9]|1[012])[/ . -](19|20)\d\d*/;

var regExpDateofBirth =  /^(0[1-9]|[12][0-9]|3[01])[/ . -](0[1-9]|1[012])[/ . -](19|20)\d\d*/;
       if (!regExpDateofBirth.test($('#txtDOB').val())) {
           alert("Textbox value must be in YY/MM/DD.. Format ");
           return false;
       }

Thanks
Harshal Raut