public static String truncateSequencesIfNecessary(String text, int maxConsecutiveLength) {
        char prev = 0;
        int sequenceCount = 1;
        for (int i = 0, m = text.length(); i < m ; i++) {
            char curr = text.charAt(i);
            if (prev == curr) {
                sequenceCount++;
                if (sequenceCount > maxConsecutiveLength) {
                    return truncateSequences(text, maxConsecutiveLength, i);
                }
            } else {
                sequenceCount = 1;
                prev = curr;
            }
        }
        return text;
    }
This will truncate sequences in a string of the same character that exceed the maximum
allowed length.

@return The same string or a new one if truncation is done.
vespajlib/src/main/java/com/yahoo/text/StringUtilities.java