Apply proper uppercase and lowercase on a String

  

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

public class Main {
  public static void main(String[] args) {
    String str = "this is a test";

    StringBuffer sb = new StringBuffer();
    Matcher m = Pattern.compile("([a-z])([a-z]*)", Pattern.CASE_INSENSITIVE).matcher(str);
    while (m.find()) {
      m.appendReplacement(sb, m.group(1).toUpperCase() + m.group(2).toLowerCase());
    }
    System.out.println(m.appendTail(sb).toString()); 
  }
}
//This Is A Test

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Apply proper uppercase and lowercase on a String : String Operation « Regular Expressions « Java

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