Java tutorial
import java.util.regex.Matcher; import java.util.regex.Pattern; public class Main { public static void main(String args[]) { Pattern p = Pattern.compile("(another) (test)"); StringBuffer sb = new StringBuffer(); String candidateString = "This is another test."; String replacement = "$1 AAA $2"; Matcher matcher = p.matcher(candidateString); matcher.find(); matcher.appendReplacement(sb, replacement); String msg = sb.toString(); System.out.println(msg); } }