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java regular expression
string example = "testXXXtest";
string result = example.substring(4,7);

Pattern pattern = Pattern.compile(".{4}(.{3}).*");
Matcher matcher = pattern.matcher("testXXXtest");
matcher.matches();
String whatYouNeed = matcher.group(1);

yourString.substring(4,7);

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

public class Example {
  public static void main(String[] args) {
    String text = "This is a testWithSomeDataInBetweentest.";
    Pattern p = Pattern.compile("test([A-Za-z0-9]*)test");
    Matcher m = p.matcher(text);
    if (m.find()) {
      System.out.println("Matched: " + m.group(1));
    } else {
      System.out.println("No match.");
    }
  }
}

Matched: WithSomeDataInBetween