java

	/**
	 * "XXXXXXXX_MON FICHIER.mov" => "S0054321_MON_FICHIER.mov"
	 * "XXXXXXXXMon Autre fichier &à  archiver .mov" => "00012345_MON_AUTRE_FICHIER_A_ARCHIVER.mov"
	 */
	public static String sanitiseFilename(String filename) {
		StringBuffer sb = new StringBuffer();
		String filename_normalized = combining_diacritical_marks.matcher(Normalizer.normalize(filename, Normalizer.Form.NFD)).replaceAll("").toUpperCase();
		
		char[] filename_chr = filename_normalized.trim().toCharArray();
		char chr;
		for (int pos = 0; pos < filename_chr.length; pos++) {
			chr = filename_chr[pos];
			if (pos > -1 & pos < 8) {
				/**
				 * add id
				 */
				sb.append(chr);
				continue;
			}
			if ((pos == 8) & (pos != (filename_chr.length - 4))) {
				/**
				 * first char after ID
				 */
				if (chr == CHR_SPACE | chr == CHR_UNDERSCORE | chr == CHR_MINUS) {
					sb.append("_");
				} else {
					sb.append("_");
					sb.append(chr);
				}
				continue;
			}
			if (pos == (filename_chr.length - 5)) {
				/**
				 * lastchar before ext
				 */
				if (chr == CHR_SPACE | chr == CHR_UNDERSCORE | chr == CHR_MINUS) {
					continue;
				}
			}
			if (pos == (filename_chr.length - 4)) {
				/**
				 * "."
				 */
				sb.append(chr);
				continue;
			}
			if (pos > (filename_chr.length - 4)) {
				/**
				 * ext
				 */
				sb.append((char) (chr + 32));
				continue;
			}
			if ((chr < 45) | (chr == CHR_DOT) | (chr == CHR_SLASH) | (chr > 57 & chr < 65) | (chr > 90 & chr < 97) | (chr > 122 & chr < 128)) {
				/**
				 * Everything else 0-9 a-z A-Z "_" "-"
				 */
				if ((sb.charAt(sb.length() - 1) != CHR_UNDERSCORE) & (sb.charAt(sb.length() - 1) != CHR_MINUS)) {
					/**
					 * The last added char is not a "_" or "-"
					 */
					sb.append("_");
				}
				continue;
			}
			sb.append(chr);
		}
		
		return sb.toString();
	}