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/*
* $Id: matchesContainsExample.java,v 1.7 2003/11/07 20:16:23 dfs Exp $
*
* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2000 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions 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.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation", "Jakarta-Oro"
* must not be used to endorse or promote products derived from this
* software without prior written permission. For written
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*
* 5. Products derived from this software may not be called "Apache"
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*
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* .
*/
package examples;
import org.apache.oro.text.regex.*;
/**
* This is a test program demonstrating the difference between the
* matches() and contains() methods.
*
* @version @version@
*/
public final class matchesContainsExample {
/**
* A common mistake is to confuse the behavior of the matches() and
* contains() methods. matches() tests to see if a string exactly
* matches a pattern whereas contains() searches for the first pattern
* match contained somewhere within the string. When used with a
* PatternMatcherInput instance, the contains() method allows you to
* search for every pattern match within a string by using a while loop.
*/
public static final void main(String args[]) {
int matches = 0;
String numberExpression = "\\d+";
String exactMatch = "2010";
String containsMatches =
" 2001 was the movie before 2010, which takes place before 2069 the book ";
Pattern pattern = null;
PatternMatcherInput input;
PatternCompiler compiler;
PatternMatcher matcher;
MatchResult result;
// Create Perl5Compiler and Perl5Matcher instances.
compiler = new Perl5Compiler();
matcher = new Perl5Matcher();
// Attempt to compile the pattern. If the pattern is not valid,
// report the error and exit.
try {
pattern = compiler.compile(numberExpression);
} catch(MalformedPatternException e) {
System.err.println("Bad pattern.");
System.err.println(e.getMessage());
System.exit(1);
}
// Here we show the difference between the matches() and contains()
// methods(). Compile the program and study the output to reinforce
// in your mind what the methods do.
System.out.println("Input: " + exactMatch);
// The following should return true because exactMatch exactly matches
// numberExprssion.
if(matcher.matches(exactMatch, pattern))
System.out.println("matches() Result: TRUE, EXACT MATCH");
else
System.out.println("matches() Result: FALSE, NOT EXACT MATCH");
System.out.println("\nInput: " + containsMatches);
// The following should return false because containsMatches does not
// exactly match numberExpression even though its subparts do.
if(matcher.matches(containsMatches, pattern))
System.out.println("matches() Result: TRUE, EXACT MATCH");
else
System.out.println("matches() Result: FALSE, NOT EXACT MATCH");
// Now we call the contains() method. contains() should return true
// for both strings.
System.out.println("\nInput: " + exactMatch);
if(matcher.contains(exactMatch, pattern)) {
System.out.println("contains() Result: TRUE");
// Fetch match and print.
result = matcher.getMatch();
System.out.println("Match: " + result);
} else
System.out.println("contains() Result: FALSE");
System.out.println("\nInput: " + containsMatches);
if(matcher.contains(containsMatches, pattern)) {
System.out.println("contains() Result: TRUE");
// Fetch match and print.
result = matcher.getMatch();
System.out.println("Match: " + result);
} else
System.out.println("contains() Result: FALSE");
// In the previous example, notice how contains() will fetch only first
// match in a string. If you want to search a string for all of the
// matches it contains, you must create a PatternMatcherInput object
// to keep track of the position of the last match, so you can pick
// up a search where the last one left off.
input = new PatternMatcherInput(containsMatches);
System.out.println("\nPatternMatcherInput: " + input);
// Loop until there are no more matches left.
while(matcher.contains(input, pattern)) {
// Since we're still in the loop, fetch match that was found.
result = matcher.getMatch();
++matches;
System.out.println("Match " + matches + ": " + result);
}
}
}
