IOS substring from string 

NSString *str=@"ASRF12353FYTEW";
 
NSString *character1 = [str substringFromIndex: 2];  
// result : RF12353FYTEW
  
NSString *character2 =[str substringToIndex:[str length]-3]; 
// result : ASRF12353FY
 
NSRange searchRange = NSMakeRange(2 , 5);
NSString *character3 = [str substringWithRange:searchRange]; 
// result : RF123

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