A file filter designed specifically for filter files within a Creator
project, used by the URL property editors.
author: gjmurphy See Also:UrlPropertyEditor
Create a new file filter for the URL property editors. The filter will
be used to determine which files are available for selection in the URL
custom property editor. The regular expression provided will be matched
against file names only (not directory names). If the pattern matcher's
matches(String) method returns true, the file is shown.