Scanner is not working on StringBuilder
<p>I wrote a program that must take input from a file and extract only text from it while saving its contents into an array. My text file contents are:</p>

<pre><code>There is some!text.written%in
the FILE[That]=Have+to`be==separated????
</code></pre>

<p>And what I have tried to code is:</p>

<pre><code>public static void main(String[] args) throws FileNotFoundException, IOException {
    BufferedReader file = new BufferedReader(new FileReader("mfile.txt"));
    List&lt;String&gt; list = new ArrayList();
    String str;
    StringBuilder filedata = new StringBuilder();
    Scanner toknizer = new Scanner(filedata.toString());
    while((str=file.readLine())!=null){
        filedata.append(str);
    }
    toknizer.useDelimiter("[^a-z]");
    while(toknizer.hasNext()){
        list.add(toknizer.next());
    }
    System.out.println(list);
}
</code></pre>

<p>at this time I only want to extract text that is written in small alphabets. But the program is printing out an empty list. Debugging revealed that <code>toknizer.hasNext()</code> is returning false in <code>while(toknizer.hasNext())</code>.
What is wrong? Am I using wrong regular expression? I got the idea of using <code>[^a-z]</code> from <a href="http://docs.oracle.com/javase/tutorial/essential/regex/char_classes.html" rel="nofollow">here</a>.</p>
