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Rules

configuration

Defines an object of custom mask rules.

rules

Object

<input id="maskedtextbox" />
<script>
$("#maskedtextbox").kendoMaskedTextBox({
    mask: "~000",
    rules: {
        "~": /[+-]/
    }
});
</script>

<input id="maskedtextbox" />
<script>
$("#maskedtextbox").kendoMaskedTextBox({
    mask: "^000^",
    rules: {
        "^": function (char) {
            return char === "^"; //allow ony "^" symbol
        }
    }
});
</script>