Java Tutorial/Development/Matcher

Matcher Find

import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class MainClass {
  public static void main(String[] args) {
    Matcher m = Pattern.rupile("\\w+").matcher("Today is Sunday");
    while (m.find())
      System.out.println(m.group());
    int i = 0;
    while (m.find(i)) {
      System.out.print(m.group() + " ");
      i++;
    }
  }
}
/* */

Today
is
Sunday
Today oday day ay y is is s Sunday Sunday unday nday day ay y

Matcher.LookingAt

import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class MainClass {
  public static void main(String[] args) {
    String[] input = new String[] { "Java has regular expressions in 1.4",
        "regular expressions now expressing in Java", "Java represses oracular expressions" };
    Pattern p1 = Pattern.rupile("re\\w*"), p2 = Pattern.rupile("Java.*");
    for (int i = 0; i < input.length; i++) {
      System.out.println("input " + i + ": " + input[i]);
      Matcher m1 = p1.matcher(input[i]), m2 = p2.matcher(input[i]);
      if (m1.lookingAt()) // No reset() necessary
        System.out.println("m1.lookingAt() start = " + m1.start() + " end = " + m1.end());
    }
  }
}
/*
*/

input 0: Java has regular expressions in 1.4
input 1: regular expressions now expressing in Java
m1.lookingAt() start = 0 end = 7
input 2: Java represses oracular expressions

Matcher Start and End

import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class MainClass {
  public static void main(String[] args) {
    String[] input = new String[] { "Java has regular expressions in 1.4",
        "regular expressions now expressing in Java", "Java represses oracular expressions" };
    Pattern p1 = Pattern.rupile("re\\w*"), p2 = Pattern.rupile("Java.*");
    for (int i = 0; i < input.length; i++) {
      System.out.println("input " + i + ": " + input[i]);
      Matcher m1 = p1.matcher(input[i]), m2 = p2.matcher(input[i]);
      while (m1.find())
        System.out.println("m1.find() "" + m1.group() + "" start = " + m1.start() + " end = "
            + m1.end());
    }
  }
}
/*
*/

input 0: Java has regular expressions in 1.4
m1.find() "regular" start = 9 end = 16
m1.find() "ressions" start = 20 end = 28
input 1: regular expressions now expressing in Java
m1.find() "regular" start = 0 end = 7
m1.find() "ressions" start = 11 end = 19
m1.find() "ressing" start = 27 end = 34
input 2: Java represses oracular expressions
m1.find() "represses" start = 5 end = 14
m1.find() "ressions" start = 27 end = 35