Regex

01 // : c12:ReplacingStringTokenizer.java
02 // From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
03 // www.BruceEckel.com. See copyright notice in CopyRight.txt.
04 

Perl
Using "while loop"

1 $count = 0;
2 while (<>) {

Sample program to counting words.

WordCount.java

01 import java.io.FileInputStream;
02 import java.nio.CharBuffer;
03 import java.nio.MappedByteBuffer;

My most programming tasks is processing text. Regular expression of regex is the tool to complete the task. Below is an example to split a data by comma. The result is stored in an array of String. I usually using it to split a CSV file.

import java.util.regex.Pattern;

public final class CSVSplit {

  private static String REGEX = ",";

  private static String INPUT = "one,two,three,four,five";

  public static void main(String[] argv) {
    Pattern p = Pattern.compile(REGEX);
    String[] items = p.split(INPUT);