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In this post, I’ll try to show you how to set up the field validation rules in Sitecore CMS User Interface. Once you’ve created a template under Sitecore Template Manager, you can define the Min and Max Length of the field.
If you want a custom length for Min and Max Length of the field. Just create an additional rule on the System -> Settings -> Validation Rules -> Field Rules -> Sample. You can find the template for creating additional validation on: /sitecore/templates/System/Validation/Validation Rule