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Valid Username Regular Expression Hackerrank Solution Java

Valid Username Regular Expression If You want Explanation Watch the video:   Sample Input 0 8 Julia Samantha Samantha_21 1Samantha Samantha?10_2A JuliaZ007 Julia@007 _Julia007 Sample Output 0 Invalid Valid Valid Invalid Invalid Valid Invalid Invalid Code: import  java.util.Scanner; class  UsernameValidator {      /*      * Write regular expression here.      */      public   static   final  String regularExpression =  "^[a-zA-Z][a-zA-Z0-9_]{7,29}" ; } public   class  Solution {      private   static   final  Scanner scan =  new  Scanner(System.in);           public   static   void  main(String[] args) {          int  n = Intege...