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Thinking in Java
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split( )

Splitting divides an input string into an array of String objects, delimited by the regular expression.

String[] split(CharSequence charseq)
String[] split(CharSequence charseq, int limit)


This is a quick and handy way of breaking up input text over a common boundary:

//: c12:SplitDemo.java
import java.util.regex.*;
import com.bruceeckel.simpletest.*;
import java.util.*;

public class SplitDemo {
  private static Test monitor = new Test();
  public static void main(String[] args) {
    String input =
      "This!!unusual use!!of exclamation!!points";
    System.out.println(Arrays.asList(
      Pattern.compile("!!").split(input)));
    // Only do the first three:
    System.out.println(Arrays.asList(
      Pattern.compile("!!").split(input, 3)));
    System.out.println(Arrays.asList(
      "Aha! String has a split() built in!".split(" ")));
    monitor.expect(new String[] {
      "[This, unusual use, of exclamation, points]",
      "[This, unusual use, of exclamation!!points]",
      "[Aha!, String, has, a, split(), built, in!]"
    });
  }
} ///:~


The second form of split( ) limits the number of splits that occur.

Notice that regular expressions are so valuable that some operations have also been added to the String class, including split( ) (shown here), matches( ), replaceFirst( ), and replaceAll( ). These behave like their Pattern and Matcher counterparts.
Thinking in Java
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   Reproduced courtesy of Bruce Eckel, MindView, Inc. Design by Interspire