In order to to use regex to validate if a given input is excluslvely "Japanese Kana", I have the following example : 

    const regex = /^[ぁ-ゔ]+$/u;

    const input = "あいうえお";

    if (regex.test(input)) {
      console.log("The input is exclusively Japanese Kana.");
    } else {
      console.log("The input is not exclusively Japanese Kana.");
    }

Upon implementation of this example code the expected output should be as follows : 

    The input is exclusively Japanese Kana.

In the above example we : 

* Created a new regular expression object and assign the regular expression to it.
* Used the test() method to test the input against the regular expression.
* If the input matches the regular expression, return true. Otherwise, return false.

A simple outline of how this code example works is : 

* ^ matches the beginning of the string.
* [ぁ-ゔ] matches any Japanese Kana character.
* '+' matches one or more of the previous character.
* $ matches the end of the string.
* u is a flag that tells the regular expression engine to treat the string as a Unicode string.

I hope this helps you in your efforts to classify "Japanese Kana", If you have any more questions regarding this or would like me to explain how to implement this information so that you can try the code yourself you have but to ask. 

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