keeping helper functions inside controller

HI,
I have following two helper kind of functions in my controller :

 private String snippetFilename(String title, String mode) {
        String filename = title.replaceAll("\\s", "_").replaceAll("\\W", "");
        String extension = metaData.getExtensions(mode);
        filename += "." + extension;
        return filename;
    }

    private void parseHtml(Snippet snippet) {
        snippet.setText(StringUtils.replaceEach(snippet.getText(), new String[]{"&", "\"", "<", ">"}, new String[]{"&amp;", "&quot;", "&lt;", "&gt;"}));
    }

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My controller functions do make use of this ?
Is it fine to keep them in controller  ?

Thanks