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

java.util.regex.Matcher.groupCount()
Returns the number of capturing groups in this matcher'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

  public String[] transform(InputRow inputRow) {
    final Matcher matcher = pattern.matcher("");
    final String value = inputRow.getValue(column);
    final boolean match = value != null && matcher.reset(value).matches();


    String[] result = new String[matcher.groupCount() + 1];
    for (int i = 0; i < result.length; i++) {
      result[i] = match ? matcher.group(i) : null;
    }
    return result;
  }

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                if (!matcher.matches()) {
                    throw new SqlToolError(
                            SqltoolRB.dsv_constcols_nullcol.getString());
                }
                constColMap.put(matcher.group(1).toLowerCase(),
                        ((matcher.groupCount() < 2 || matcher.group(2) == null)
                        ? "" : matcher.group(2)));
            }
        }
        Set<String> skipCols = null;
        if (dsvSkipCols != null) {

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        list.add("cmd.exe");
        list.add("/y");
        list.add("/c");
        Matcher m = wincmdPattern.matcher(monolithic);
        while (m.find()) {
            for (int i = 1; i <= m.groupCount(); i++) {
                if (m.group(i) == null) continue;
                if (m.group(i).length() > 1 && m.group(i).charAt(0) == '"') {
                    list.add(m.group(i).substring(1, m.group(i).length() - 1));
                    continue;
                }

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                    if (buffer == null) {
                        stdprintln(nobufferYetString);
                        return;
                    }
                    newVal.append(buffer.val);
                    if (matcher.groupCount() > 1 && matcher.group(2) != null
                            && matcher.group(2).length() > 0)
                        newVal.append(matcher.group(2));
                    newType = buffer.type;
                } else {
                    matcher = spMacroPattern.matcher(defString);

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                if (macroToken == null)
                    throw new BadSpecial(SqltoolRB.macro_undefined.getString(
                            matcher.group(1)));
                setBuf(macroToken);
                buffer.line = defToken.line;
                if (matcher.groupCount() > 1 && matcher.group(2) != null
                        && matcher.group(2).length() > 0)
                    buffer.val += matcher.group(2);
                preempt = matcher.group(matcher.groupCount()).equals(";");
        }
    }

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                setBuf(macroToken);
                buffer.line = defToken.line;
                if (matcher.groupCount() > 1 && matcher.group(2) != null
                        && matcher.group(2).length() > 0)
                    buffer.val += matcher.group(2);
                preempt = matcher.group(matcher.groupCount()).equals(";");
        }
    }


    /**
     * Convert a String to a byte array by interpreting every 2 characters as

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                // groups.  Unfortunately, there's no way to guarantee that :( .
            }
            histNum = ((hm.group(1) == null || hm.group(1).length() < 1)
                    ? null : Integer.valueOf(hm.group(1)));
        }
        if (hm.groupCount() != 2) {
            throw new BadSpecial(SqltoolRB.edit_malformat.getString());
            // Empirically, I find that this pattern always captures two
            // groups.  Unfortunately, there's no way to guarantee that :( .
        }
        commandChar = ((hm.group(2) == null || hm.group(2).length() < 1)

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                        throw new BadSubst(
                                SqltoolRB.substitution_malformat.getString());
                    }


                    // Note that this pattern does not include the leading :.
                    if (m.groupCount() < 3 || m.groupCount() > 4) {
                        throw new RuntimeException(
                                "Internal assertion failed.  "
                                + "Matched substitution "
                                + "pattern, but captured "
                                + m.groupCount() + " groups");

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                        throw new BadSubst(
                                SqltoolRB.substitution_malformat.getString());
                    }


                    // Note that this pattern does not include the leading :.
                    if (m.groupCount() < 3 || m.groupCount() > 4) {
                        throw new RuntimeException(
                                "Internal assertion failed.  "
                                + "Matched substitution "
                                + "pattern, but captured "
                                + m.groupCount() + " groups");

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                    if (m.groupCount() < 3 || m.groupCount() > 4) {
                        throw new RuntimeException(
                                "Internal assertion failed.  "
                                + "Matched substitution "
                                + "pattern, but captured "
                                + m.groupCount() + " groups");
                    }
                    String optionGroup = (
                            (m.groupCount() > 3 && m.group(4) != null)
                            ? (new String(m.group(4))) : null);

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