Validate range-words in Form component (UI Component)

[robinhuy]

I cannot configure a form field with validation range-words, it different than validate-number-range

Preconditions

1. Magento 2

Steps to reproduce

1. Edit {Magento root directory}/app/code/Magento/Catalog/view/adminhtml/ui_component/new_category_form.xml:
   In node with '<field name="name"' replace

<rule name="required-entry" xsi:type="boolean">true</item>

to

<rule name="range-words" xsi:type="array">
<item name="0" xsi:type="number">1</item>
<item name="1" xsi:type="number">3</item>
</rule>

2. Flush cache.
3. In Admin, open any product and click "New Category"
4. Enter any value in "Category Name" field, set any "Parent Category" and press "Create Category"

Expected result

Category Name is validated and Category is created (or correct error message is displayed, if validation fails)

Actual result

Nothing happens explicitly. Error message appers in browser console.

When I test above code, it fired a bug in Chrome Console:
rules.js:78 Uncaught TypeError: Cannot read property 'length' of null

In rules.js

"range-words": [
    function(value, params) {
    return utils.stripHtml(value).match(/\b\w+\b/g).length >= params[0] &&
        value.match(/bw+b/g).length < params[1];
    },
    $.mage.__('Please enter between {0} and {1} words.')
]

Why the regex pattern check with params[0] and params[1] is different?

This is my fault or Magento bug and how to use range-words validation ?

[veloraven]

@robinhuy thank you for your report.
Please, provide the used Magento version.

[robinhuy]

@veloraven: I'm using Magento version 2.1 clone from github

[picamator]

@robinhuy thank you for giving details about version.

You are correctly using validator. The regex patterns should be the same.
We've created internal ticket MAGETWO-57147 to fix it.