java regular expression

hi i need java expression which allows all characters with minimum 2 characters and maximum 20 characters in answers field after selecting security questions

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February 2, 2012 at 4:43 PM

import java.util.*;
import java.util.regex.*;

class RegularExpression {

        public static boolean validateString(String st) {
                return st.matches("^[a-zA-Z]{2,20}$");
        }

        public static void main(String[] args) {
                Scanner input = new Scanner(System.in);
                System.out.print("Enter String: ");
                String str = input.nextLine();
                while (validateString(str) != true) {
                        System.out.print("Invalid String!");
                        System.out.println();
                        System.out.print("Enter String: ");
                        str = input.nextLine();
                }

        }
}

February 2, 2012 at 4:43 PM

import java.util.*;
import java.util.regex.*;

class RegularExpression {

        public static boolean validateString(String st) {
                return st.matches("^[a-zA-Z]{2,20}$");
        }

        public static void main(String[] args) {
                Scanner input = new Scanner(System.in);
                System.out.print("Enter String: ");
                String str = input.nextLine();
                while (validateString(str) != true) {
                        System.out.print("Invalid String!");
                        System.out.println();
                        System.out.print("Enter String: ");
                        str = input.nextLine();
                }

        }
}

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