private byte[] extractRowFromMetaRow(final byte[] b) {
    int firstDelimiter = Bytes.searchDelimiterIndex(b, 0, b.length, HConstants.DELIMITER);
    int lastDelimiter = Bytes.searchDelimiterIndexInReverse(b, 0, b.length, HConstants.DELIMITER);
    int length = lastDelimiter - firstDelimiter - 1;
    byte[] row = new byte[length];
    System.arraycopy(b, firstDelimiter + 1, row, 0, length);
    return row;
  }
@param answer Pass -1 if we're not to find anything.
@return Row found.
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestGetClosestAtOrBefore.java