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copied!<p>It's probably the <a href="http://en.wikipedia.org/wiki/Null_character" rel="nofollow noreferrer">NULL character</a> which is represented by <code>\0</code>. You can get rid of it by <a href="http://download.oracle.com/javase/6/docs/api/java/lang/String.html#trim%28%29" rel="nofollow noreferrer"><code>String#trim()</code></a>.</p> <p>To nail down the exact codepoint, do so:</p> <pre><code>for (char c : string.toCharArray()) { System.out.printf("U+%04x ", (int) c); } </code></pre> <p>Then you can find the exact character <a href="http://www.fileformat.info/info/unicode/char/search.htm" rel="nofollow noreferrer">here</a>.</p> <hr> <p><strong>Update:</strong> as per the update:</p> <blockquote> <p>Anyone know of a way to just include a range of valid characters instead of excluding 95% of the UTF8 range?</p> </blockquote> <p>You can do that with help of regex. See the answer of @polygenelubricants here and <a href="https://stackoverflow.com/questions/3069634/does-anyone-know-some-java-class-that-return-a-operating-system-friendly-filename/3069681#3069681">this answer</a>.</p> <p>On the other hand, you can also just fix the problem in its root instead of workarounding it. Either update the files to get rid of the BOM mark, it's a legacy way to distinguish UTF-8 files from others which is nowadays worthless, or use a <code>Reader</code> which recognizes and skips the BOM. Also see <a href="https://stackoverflow.com/questions/1835430/byte-order-mark-screws-up-file-reading-in-java">this question</a>.</p>

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