Equivalent to indexOfElement(targetBytes, 0).
Returns the first index in this buffer that is at or after
fromIndex and that contains any of the bytes in
targetBytes. This expands the buffer as necessary until a target byte is found. This reads an unbounded number of bytes into the buffer. Returns -1 if the stream is exhausted before the requested byte is found.
ByteString ANY_VOWEL = ByteString.encodeUtf8("AEOIUaeoiu");
Buffer buffer = new Buffer();
buffer.writeUtf8("Dr. Alan Grant");
assertEquals(4, buffer.indexOfElement(ANY_VOWEL)); // 'A' in 'Alan'.
assertEquals(11, buffer.indexOfElement(ANY_VOWEL, 9)); // 'a' in 'Grant'.