Regular Expression Pocket Reference, 2nd Edition

Examples

Example 1-5. Simple match

import java.util.regex.*;

// Find Spider-Man, Spiderman, SPIDER-MAN, etc.
public class StringRegexTest {
  public static void main(String[] args) throws Exception {
    String dailyBugle = "Spider-Man Menaces City!";

      //regex must match entire string
    String regex = "(?i).*spider[- ]?man.*";

    if (dailyBugle.matches(regex)) {
      System.out.println("Matched: " + dailyBugle);
    }
  }
 }

Example 1-6. Match and capture group

// Match dates formatted like MM/DD/YYYY, MM-DD-YY,...
import java.util.regex.*;

public class MatchTest {
  public static void main(String[] args) throws Exception {
    String date = "12/30/1969";
    Pattern p =
       Pattern.compile("^(\\d\\d)[-/](\\d\\d)[-/](\\d\\d(?:\\d\
\d)?)$");
    Matcher m = p.matcher(date);

    if (m.find( )) {
      String month = m.group(1);
      String day   = m.group(2);
      String year  = m.group(3);
      System.out.printf("Found %s-%s-%s\n", year, month, day);
    }
  }
 }

Example 1-7. Simple substitution

// Example -. Simple substitution
// Convert <br> to <br /> for XHTML compliance
import java.util.regex.*;

  public class SimpleSubstitutionTest
 {  public static void main(String[] args) {
    String text = "Hello world. <br>";
    Pattern p = Pattern.compile("<br>", Pattern.CASE_
INSENSITIVE);
    Matcher m = p.matcher(text);

    String result = m.replaceAll("<br />");
    System.out.println(result);
  }
 }

Example 1-8. Harder substitution

// urlify - turn URLs into HTML links import java.util.regex.*; public class Urlify { public static void main (String[ ] args) throws Exception { String ...