RegexTestHarness2.java Source code

Introduction

Here is the source code for RegexTestHarness2.java

Source

/* From http://java.sun.com/docs/books/tutorial/index.html */

/*
 * Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * -Redistribution of source code must retain the above copyright notice, this
 *  list of conditions and the following disclaimer.
 *
 * -Redistribution in binary form must reproduce the above copyright notice,
 *  this list of conditions and the following disclaimer in the documentation
 *  and/or other materials provided with the distribution.
 *
 * Neither the name of Sun Microsystems, Inc. or the names of contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
 * ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
 * OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN")
 * AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE
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import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;

public final class RegexTestHarness2 {

    private static String REGEX;

    private static String INPUT;

    private static BufferedReader br;

    private static Pattern pattern;

    private static Matcher matcher;

    private static boolean found;

    public static void main(String[] argv) {
        initResources();
        processTest();
        closeResources();
    }

    private static void initResources() {
        try {
            br = new BufferedReader(new FileReader("regex.txt"));
        } catch (FileNotFoundException fnfe) {
            System.out.println("Cannot locate input file! " + fnfe.getMessage());
            System.exit(0);
        }
        try {
            REGEX = br.readLine();
            INPUT = br.readLine();
        } catch (IOException ioe) {
        }

        try {
            pattern = Pattern.compile(REGEX);
            matcher = pattern.matcher(INPUT);
        } catch (PatternSyntaxException pse) {
            System.out.println("There is a problem with the regular expression!");
            System.out.println("The pattern in question is: " + pse.getPattern());
            System.out.println("The description is: " + pse.getDescription());
            System.out.println("The message is: " + pse.getMessage());
            System.out.println("The index is: " + pse.getIndex());
            System.exit(0);
        }

        System.out.println("Current REGEX is: " + REGEX);
        System.out.println("Current INPUT is: " + INPUT);
    }

    private static void processTest() {
        while (matcher.find()) {
            System.out.println("I found the text \"" + matcher.group() + "\" starting at index " + matcher.start()
                    + " and ending at index " + matcher.end() + ".");
            found = true;
        }

        if (!found) {
            System.out.println("No match found.");
        }
    }

    private static void closeResources() {
        try {
            br.close();
        } catch (IOException ioe) {
        }
    }
}