Replace all occourances of a string

import java.util.regex.Matcher;

import java.util.regex.Pattern;

public class Main

   public static void main(String args[])

      Pattern p = Pattern.compile("hello");

      String instring = "hello hello hello.";

      System.out.println("initial String: "+ instring);

      Matcher m = p.matcher(instring);

      String tmp = m.replaceAll("Java");

      System.out.println("String after replacing 1st Match: "+tmp);

Make first letter of each word in Uppercase

import java.util.regex.Matcher;

import java.util.regex.Pattern;

            public class Main

   public static void main(String[] args)

      String str = "this is a java test";

      System.out.println(str);

      StringBuffer stringbf = new StringBuffer();

      Matcher m = Pattern.compile("([a-z])([a-z]*)",

      Pattern.case_insensitive).matcher(str);

      while (m.find())

         m.appendReplacement(stringbf,

         m.group(1).toUpperCase() + m.group(2).toLowerCase());

      System.out.println(m.appendTail(stringbf).toString());