Learning Java regular expression

RegexTest.java

public class RegexTestStrings {
  public static final String TEST = "This is my small example string which I'm going to use for pattern matching.";
  
  public static void main(String[] args) {
  	System.out.println(TEST.matches("\\w.*"));
    // split by whitespace
    String[] splitStr = TEST.split("\\s+");
    System.out.println(splitStr.length);
    for (String str : splitStr) {
      System.out.println(str);
    }
    // replace all whitespace with tabs
    System.out.println(TEST.replaceAll("\\s+", "\t"));
  }
}