I was trying to match files in a directory that had two dots in their name, something like theme.default.properties
I thought the pattern .\\..\\.. should be the required pattern [. matches any character and \. matches a dot] but it matches both oneTwo.txt and theme.default.properties

I tried the following:
[resources/themes has two files oneTwo.txt and theme.default.properties]
1.

public static void loadThemes()
{
    File themeDirectory = new File("resources/themes");
    if(themeDirectory.exists())
    {
        File[] themeFiles = themeDirectory.listFiles();
        for(File themeFile : themeFiles)
        {
            if(themeFile.getName().matches(".\\..\\.."));
            {
                System.out.println(themeFile.getName());
            }
        }
    }
}

This prints nothing

and the following

File[] themeFiles = themeDirectory.listFiles(new FilenameFilter()
{
    public boolean accept(File dir, String name)
    {
    return name.matches(".\\..\\..");
    }
});

for (File file : themeFiles)
{
    System.out.println(file.getName());
}

prints both

oneTwo.txt
theme.default.properties

I am unable to find why these two give different results and which pattern I should be using to match two dots...

Can someone help?