Examples of java.util.regex.MatchResult.groupCount()

java.util.regex.MatchResult.groupCount()
Returns the number of capturing groups in this match result's pattern.
Group zero denotes the entire pattern by convention. It is not included in this count.
Any non-negative integer smaller than or equal to the value returned by this method is guaranteed to be a valid group index for this matcher.
@return The number of capturing groups in this matcher's pattern

        assertEquals(0, result.start());
        assertEquals(4, result.end());
        assertEquals(0, result.start(0));
        assertEquals(4, result.end(0));
        assertEquals("True", result.group());
        assertEquals(0, result.groupCount());
        
    }
     
    /**
     * @throws IOException

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        assertEquals(3, result.end());
        assertEquals(2, result.start(0));
        assertEquals(3, result.end(0));
        assertEquals("2", result.group());
        assertEquals("2", result.group(0));
        assertEquals(0, result.groupCount());
        try {
            result.start(1);
            fail("should throw IndexOutOfBoundsException");
        } catch (IndexOutOfBoundsException e) {
            // Expected

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        Scanner scanner = new Scanner( new ByteArrayInputStream( message.getBytes() ) );
        String foundString = scanner.findWithinHorizon( ".*line (\\d+):(\\d+): *([^\\n]*).*", message.length() );
        if ( foundString != null )
        {
            MatchResult result = scanner.match();
            if ( result.groupCount() == 3 )
            {
                ExceptionMessage exceptionMessage = new ExceptionMessage();
                exceptionMessage.lineNumber = result.group( 1 );
                exceptionMessage.columnNumber = result.group( 2 );
                exceptionMessage.cause = result.group( 3 );

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        Scanner scanner = new Scanner(text);
        String versionNums = scanner.findWithinHorizon("(\\d+)(\\.\\d+)(\\.\\d+)?", 0);
        String version = "";
        if (versionNums != null) {
            MatchResult groups = scanner.match();
            for (int i = 1; i <= groups.groupCount() && groups.group(i) != null; i++) // yes, truly 1-indexed
                version += groups.group(i);
        }
        return version;
    }

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  static void useRegex() {
    String input = "1 fish 2 fish red fish blue fish";
    Scanner s = new Scanner(input);
    s.findInLine("(\\d+) fish (\\d+) fish (\\w+) fish (\\w+)");
    MatchResult result = s.match();
    for (int i=1; i<=result.groupCount(); i++)
      System.out.println(result.group(i));
    s.close();
  }


  static void readFile() {

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    public Object[] getParametersFromMethodString(String methodString) throws Exception {
        List<Object> params = new ArrayList<Object>();
        Matcher matcher = getMatcherFor(methodString);
        if (matches(matcher)) {
            MatchResult matchResult = matcher.toMatchResult();
            for (int index = 1; index <= matchResult.groupCount(); index++) {
                params.add(matchResult.group(index));
            }
        }
        return parser.convertParamertersToTypes(
                params.toArray(new Object[params.size()]), method.getParameterTypes());

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    @Override
    protected String group(int index, int groupNumber) {
        MatchResult result = getMatch(index);


        if (groupNumber <= result.groupCount()) {
            return result.group(groupNumber);
        }


        return null;
    }

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    @Override
    protected String group(int index, int groupNumber) {
        MatchResult result = getMatch(index);


        if (groupNumber <= result.groupCount()) {
            return result.group(groupNumber);
        }


        return null;
    }

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    @Override
    protected String group(int index, int groupNumber) {
        MatchResult result = getMatch(index);


        if (0 <= groupNumber && groupNumber <= result.groupCount()) {
            return result.group(groupNumber);
        }


        return null;
    }

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      scanner.next(REG_EX_REQUEST_LINE);
      currentLineNumber++;
      final String method;
      final String uri;
      MatchResult result = scanner.match();
      if (result.groupCount() == 2) {
        method = result.group(1);
        uri = result.group(2).trim();
      } else {
        currentLineNumber++;
        throw new BatchException(BatchException.INVALID_REQUEST_LINE.addContent(scanner.next()).addContent(

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