public static String camelToUpper(String camel) {
    camel = camel.replaceAll("\\+", "_PLUS");
    camel = camel.replaceAll("\\-", "_MINUS");
    camel = camel.replaceAll("&", "AND");
    camel = camel.replaceAll("[/@()]", "_");
    camel = camel.replaceAll("\\s", "_");
    camel = camel.replaceAll("'", "");
    boolean wasLower = false;
    String out = "";
    String upper = camel.toUpperCase();
    for (int i = 0; i < camel.length(); i++) {
      char c = upper.charAt(i);
      boolean isUpper = (c == camel.charAt(i));
      if (isUpper && wasLower && c != '_')
        out = out + "_";
      out = out + c;
      wasLower = !isUpper;
    }
    if (out.substring(0, 1).matches("[0-9]"))
      out = "_" + out;
    out = out.replaceAll("_+", "_");
    out = out.replaceAll("_$", "");
    return out;
  }