final int realGroupCount = pacStream.readInt();
                if (realGroupCount != groupCount) {
                    throw new PACDecodingException("Invalid number of groups in PAC expect" + groupCount + " have " + realGroupCount);
                }
                groups = new PacGroup[groupCount];
                for (int i = 0; i < groupCount; i++) {
                    pacStream.align(4);

  }

  public void testGet_regex() {
    assertThat(ArbitraryInstances.get(Pattern.class).pattern())
        .isEqualTo(Pattern.compile("").pattern());
    assertEquals(0, ArbitraryInstances.get(MatchResult.class).groupCount());
  }

  public void testGet_usePublicConstant() {
    assertThat(ArbitraryInstances.get(WithPublicConstant.class))
        .isSameInstanceAs(WithPublicConstant.INSTANCE);
  }

  }

  public void testGet_regex() {
    assertThat(ArbitraryInstances.get(Pattern.class).pattern())
        .isEqualTo(Pattern.compile("").pattern());
    assertEquals(0, ArbitraryInstances.get(MatchResult.class).groupCount());
  }

  public void testGet_usePublicConstant() {
    assertThat(ArbitraryInstances.get(WithPublicConstant.class))
        .isSameInstanceAs(WithPublicConstant.INSTANCE);
  }

        if (matcher.find()) {
            if (logger.isDebugEnabled()) {
                logger.debug("Matched: {}", matcher.group());
            }
            if (matcher.groupCount() > 0) {
                return matcher.group(1);
            }
        }
        return null;
    }

    /**
     * Replaces credentials in the given value.

        if (matcher.find()) {
            if (logger.isDebugEnabled()) {
                logger.debug("Matched: {}", matcher.group());
            }
            if (matcher.groupCount() > 0) {
                return matcher.group(1);
            }
        }
        return null;
    }

    /**
     * Replaces credentials in the given value.

        Matcher match = mappingsPattern.matcher(dependencyName);
        if (match.matches()) {
            int i = 0;
            while (i < match.groupCount() && match.group(i + 1) == null) {
                ++i;
            }
            return mapped.get(i);
        }
        return dependencyName;
    }