var postcodes = ["00-240", "80", "32", "90", "91"];

$('#test').keyup(function () {debugger;

    var val = this.value; 

    var m = $.map(postcodes, function (value, index) {

      if(val.length>2 && val.indexOf("-")>-1 && !(value.indexOf("-")>-1))

        val= val.substring(0,val.indexOf("-"))

      var reg = new RegExp('^' + val + '.*$');

        return value.match(reg);

    });

    $('#msg').text(m.length && val.length ? 'allowed' : 'not allowed');

});