Java Http header byte range decoder

ParseHeaderByteRange.java

import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Http header byte range decoder.
 * According to http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.35
 */
public class ParseHeaderByteRange {

    public static void main(final String[] args) {
        final String input = "bytes=33-22,-333,20-";

        final String byteRangeSetRegex = "(((?<byteRangeSpec>(?<firstBytePos>\\d+)-(?<lastBytePos>\\d+)?)|(?<suffixByteRangeSpec>-(?<suffixLength>\\d+)))(,|$))";
        final String byteRangesSpecifierRegex = "bytes=(?<byteRangeSet>" + byteRangeSetRegex + "{1,})";
        final Pattern byteRangeSetPattern = Pattern.compile(byteRangeSetRegex);
        final Pattern byteRangesSpecifierPattern = Pattern.compile(byteRangesSpecifierRegex);
        final Matcher byteRangesSpecifierMatcher = byteRangesSpecifierPattern.matcher(input);
        if (byteRangesSpecifierMatcher.matches()) {
            final String byteRangeSet = byteRangesSpecifierMatcher.group("byteRangeSet");
            final Matcher byteRangeSetMatcher = byteRangeSetPattern.matcher(byteRangeSet);
            while (byteRangeSetMatcher.find()) {
                if (byteRangeSetMatcher.group("byteRangeSpec") != null) {
                    System.out.println(
                            String.format("range: %s->%s", byteRangeSetMatcher.group("firstBytePos"), byteRangeSetMatcher.group("lastBytePos")));
                }
                if (byteRangeSetMatcher.group("suffixByteRangeSpec") != null) {
                    System.out.println(String.format("suffix length: %s", byteRangeSetMatcher.group("suffixLength")));
                }
            }
        } else {
            System.out.println("Invalid range header");
        }
    }

}