wro4j-core/src/main/java/ro/isdc/wro/util/StringUtils.java
private static String deleteAny(final String inString,
      final String charsToDelete) {
    if (!hasLength(inString) || !hasLength(charsToDelete)) {
      return inString;
    }
    final StringBuffer out = new StringBuffer();
    for (int i = 0; i < inString.length(); i++) {
      final char c = inString.charAt(i);
      if (charsToDelete.indexOf(c) == -1) {
        out.append(c);
      }
    }
    return out.toString();
  }
private static String deleteAny(final String inString,
      final String charsToDelete) {
    if (!hasLength(inString) || !hasLength(charsToDelete)) {
      return inString;
    }
    final StringBuffer out = new StringBuffer();
    for (int i = 0; i < inString.length(); i++) {
      final char c = inString.charAt(i);
      if (charsToDelete.indexOf(c) == -1) {
        out.append(c);
      }
    }
    return out.toString();
  }
Delete any character in a given String.

@param inString
the original String
@param charsToDelete
a set of characters to delete. E.g. "az\n" will delete 'a's, 'z's
and new lines.
@return the resulting String