public static String unescapePRPath(String escapedPath) {
    String path = escapedPath.replace('_', SEPARATOR_CHAR);
    path = path.replace(THREE_SEPARATORS, SEPARATOR + "_");
    path = path.replace(TWO_SEPARATORS, "_");
    return path;
  }
Get the bucket string by parsing the region fullPath

@param bucketFullPath full region path to parse
@return the bucket string or null if no bucket string is present
geode-core/src/main/java/org/apache/geode/internal/cache/PartitionedRegionHelper.java