Java Regex to convert string to ascii code and ascii code to string back

MainClass.java

package com.pkm;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class MainClass {
    public static void main(String[] args) {
        String str1 = "(=>THAI(คุณ), HINDI:(तुम मेरी हो), HANGERIO:(تو مال منی), CHINA:(您), ARBI(أنت), FARSI(شما)";
        System.out.println("\n\nOriginal :: " +str1);        
        Pattern pattern = Pattern.compile("([^\\x00-\\x7F])|([^A-Za-z0-9-_])");
        StringBuffer output = new StringBuffer();
        Matcher matcher = pattern.matcher(str1);
        while (matcher.find()) {
            String mString = matcher.group(0);
            String rep = String.format("[%d \\%s = %d]", 
                    mString.length(), mString,
                    (int) mString.charAt(0));
            String rep2 = String.format("&#%d;", (int) mString.charAt(0));
            matcher.appendReplacement(output, rep2);
        }
        matcher.appendTail(output);
        System.out.println("Output   :: " + output.toString());
        
        pattern = Pattern.compile("\\&\\#\\d{2,}\\;");
        matcher = pattern.matcher(output.toString());
        output = new StringBuffer();
        while (matcher.find()) {
            String mString = matcher.group(0);
            mString = mString.substring(2);
            mString = mString.substring(0, mString.length() - 1);
            mString = Character.toString((char) Integer.parseInt(mString));
            matcher.appendReplacement(output, mString);
        }
        matcher.appendTail(output);
        System.out.println("Output   :: " + output.toString());
    }
}

Output as follows:

Original :: (=>THAI(คุณ), HINDI:(तुम मेरी हो), HANGERIO:(تو مال منی), CHINA:(您), ARBI(أنت), FARSI(شما)


Output   :: &#40&#59;=>THAI(คุณ), HINDI:(तुम मेरी हो), HANGERIO:(تو مال منی), CHINA:(您), ARBI(أنت), FARSI(شما)


Output   :: (=>THAI(คุณ), HINDI:(तुम मेरी हो), HANGERIO:(تو مال منی), CHINA:(您), ARBI(أنت), FARSI(شما)

Java code to convert string to ascii code and ascii code to string back