Write a Javaprogram that prints all strings defined by a regular expressionup to

Question

Write a Javaprogram that prints all strings defined by a regular expressionup to a givenlength. Assume the alphabet ={1,0}. Prompt the user to enter a regular expression and an integer n. Print all the strings, with length n, defined by the regular expression.Use console based I/O. [The empty string can be printed with the Unicode “u03B5”, but Unicode may not be supported in some environments].

A samplerun of the program is shown bellow.

Regular expression: 01*|(10)*

n: 5

-------Strings in the language -------

0

01

10

011

0111

1010

01111

Explanation / Answer

This program will get the user input for number n and print the result

import java.util.regex.*;
import java.util.Scanner;
/*
* Checks for invalid characters
* in email addresses
*/
class RegularExpression {
   public static void main(String[] args)
                                 throws Exception {
                               
      String input = "^01*|(10)*$";
      Scanner reader = new Scanner(System.in); // Reading from System.in
      System.out.println("Enter a number: ");
        int n = reader.nextInt();
      Pattern p1 = Pattern.compile(input);

      Matcher regexMatcher = regex.matcher(subjectString);
    while (regexMatcher.find()) {
        for (int i = 1; i <= n; i++) {
            // matched text: regexMatcher.group(i)
            // match start: regexMatcher.start(i)
            // match end: regexMatcher.end(i)
        }
    }
catch (PatternSyntaxException ex) {
    // Syntax error in the regular expression
}
                                 }
   }

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