src/main/java/io/mola/galimatias/URL.java
public String queryParameter(final String name) {
        if (name == null) {
            throw new NullPointerException("name is null");
        }
        if (query == null || query.isEmpty()) {
            return null;
        }
        int start = 0;
        do {
            final int nextAmpersand = query.indexOf('&', start);
            final int end = (nextAmpersand == -1)? query.length() : nextAmpersand;
            int nextEquals = query.indexOf('=', start);
            if (nextEquals == -1 || nextEquals > end) {
                nextEquals = end;
            }
            final int thisNameLength = nextEquals - start;
            final int thisValueLength = end - nextEquals;
            if (thisNameLength == name.length() && query.regionMatches(start, name, 0, name.length())) {
                if (thisValueLength == 0) {
                    return "";
                }
                return query.substring(nextEquals + 1, end);
            }
            if (nextAmpersand == -1) {
                break;
            }
            start = nextAmpersand + 1;
        } while (true);
        return null;
    }
public String queryParameter(final String name) {
        if (name == null) {
            throw new NullPointerException("name is null");
        }
        if (query == null || query.isEmpty()) {
            return null;
        }
        int start = 0;
        do {
            final int nextAmpersand = query.indexOf('&', start);
            final int end = (nextAmpersand == -1)? query.length() : nextAmpersand;
            int nextEquals = query.indexOf('=', start);
            if (nextEquals == -1 || nextEquals > end) {
                nextEquals = end;
            }
            final int thisNameLength = nextEquals - start;
            final int thisValueLength = end - nextEquals;
            if (thisNameLength == name.length() && query.regionMatches(start, name, 0, name.length())) {
                if (thisValueLength == 0) {
                    return "";
                }
                return query.substring(nextEquals + 1, end);
            }
            if (nextAmpersand == -1) {
                break;
            }
            start = nextAmpersand + 1;
        } while (true);
        return null;
    }
Gets the first query parameter value for a given name.

@see {@link #queryParameters(String)}

@param name Parameter name.
@return The first parameter value or null if there parameter is not present.