Maximum length zip code validation

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I am using Magento 2.2 , Zip code validation is not working .` Coding part1:

"validate-zip-in": [
            function(value) {
                return utils.isEmptyNoTrim(value) || /(^\d{6}$)/.test(value);

            },
            $.mage.__('Please enter a valid zip code (Ex: 123456).')
        ],

Coding part 2:checkout_index_index.xml

</item>
                            <item name="validation" xsi:type="array">
                                                                    <item name="validate-digits" xsi:type="string">true</item>
                                                            </item>  
                            <item name="validation" xsi:type="array">
                                    <item name="validate-zip-in" xsi:type="string" pattern="[0-9]*" max-length="6">true</item>
                                <item name="zip-range" xsi:type="string">6</item>
                            </item> `

But it is not working . I want validate maximum length “6” for India.please reply as soon as possible
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