Recently, on checking UX of Google Drive Forums. I came across how google has handled validation states for Text Box , Below are screenshots

Clearly indicated Min 10 characters required. Max 100 Character limit. Usually some of us show a error message after user enters. By giving user a hint of characters it reduces user input errors.

As we type count changes

On reaching maximum character limit.

By doing some small tweaks in User interface it makes user experience much better.

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