title: Regex for check the input string is just in persian language
body: <p>I work with MVC and I am new on it. I want to check input values is only in Persian language (Characters) by <code>[RegularExpression]</code> Validation.
   So I think to use Regex and need to check in range of unicodes, but I don't lnow how can find range of Persian characters Unicode. Am I right about this Regex? what is your suggestion and how can I find range of Unicode in Persian</p>