Extracting all present dates in any given String using Regular Expressions

import java.io.*;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

public class GFG {

    public static void main(String[] args)

    {

        String str

            = "The First Version was released on 12-07-2008."

              + "Next Release will might come on 12 July 2009. "

              + "The due date for paymnet is  2023-09-1."

              + "India gained its freedom on 15 August 1947 which was a Friday."

              + "Republic Day is a public holiday in India where the country marks and celebrates "

              + "the date on which the Constitution of India came into effect on 26-1-1950.";

        String strPattern[] = {

            "\\d{2}-\\d{2}-\\d{4}",

            "[0-9]{2}[/]{1}[0-9]{2}[/]{1}[0-9]{4}",

            "\\d{1, 2}-(January|February|March|April|May|June|July|August|September|October|November|December)-\\d{4}",

            "\\d{4}-\\d{1, 2}-\\d{1, 2}",

            "[0-9]{1, 2}\\s(January|February|March|April|May|June|July|August|September|October|November|December)\\s\\d{4}",

            "\\d{1, 2}-\\d{1, 2}-\\d{4}"

        };

        for (int i = 0; i < strPattern.length; i++) {

            Pattern pattern

                = Pattern.compile(strPattern[i]);

            Matcher matcher = pattern.matcher(str);

            while (matcher.find()) {

                System.out.println(matcher.group());

            }

        }

    }

}

import java.io.*;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

public class GFG {

    public static void main(String[] args)

    {

        String str

            = "The First Version was released on 12-07-2008."

              + "Next Release will might come on 12 July 2009. "

              + "The due date for paymnet is  2023-09-1."

              + "India gained its freedom on 15 August 1947 which was a Friday."

              + "Republic Day is a public holiday in India where the country marks and celebrates "

              + "the date on which the Constitution of India came into effect on 26-1-1950.";

        String strPattern[] = {

            "\\d{2}-\\d{2}-\\d{4}",

            "[0-9]{2}[/]{1}[0-9]{2}[/]{1}[0-9]{4}",

            "\\d{1, 2}-(January|February|March|April|May|June|July|August|September|October|November|December)-\\d{4}",

            "\\d{4}-\\d{1, 2}-\\d{1, 2}",

            "[0-9]{1, 2}\\s(January|February|March|April|May|June|July|August|September|October|November|December)\\s\\d{4}",

            "\\d{1, 2}-\\d{1, 2}-\\d{4}"

        };

        for (int i = 0; i < strPattern.length; i++) {

            Pattern pattern

                = Pattern.compile(strPattern[i]);

            Matcher matcher = pattern.matcher(str);

            while (matcher.find()) {

                System.out.println(matcher.group());

            }

        }

    }

}