Reuse Pattern Method : Pattern « Regular Expressions « Java Tutorial

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

public class MainClass {
  public static void main(String args[]) {
    Pattern p = Pattern.compile("\\d");
    Matcher matcher = p.matcher("5");
    boolean isOk = matcher.matches();
    System.out.println("original pattern matches " + isOk);

    // recycle the pattern
    String tmp = p.pattern();
    Pattern p2 = Pattern.compile(tmp);
    matcher = p.matcher("5");
    isOk = matcher.matches();
    System.out.println("second pattern matches " + isOk);

8.5.1.Use Pattern class to match
8.5.2.Pattern.compile method
8.5.3.Reuse Pattern Method
8.5.4.Control the pattern case
8.5.5.A simple pattern matching demo.
8.5.6.Use find() to find a subsequence.
8.5.7.Use find() to find multiple subsequences.
8.5.8.Use a quantifier.
8.5.9.Use wildcard and quantifier.
8.5.10.Use the ? quantifier.
8.5.11.Use a character class.
8.5.12.Split by number
8.5.13.Split by :