TokenizerMapper.java

public static class TokenizerMapper extends Mapper<Object, Text, Text, IntWritable> {
    private static final Pattern pattern = Pattern.compile("\"([^\"]*)\"");
    private final static IntWritable one = new IntWritable(1);
    private Text word = new Text();

    public void map(Object key, Text value, Context context) throws IOException, InterruptedException {
        Matcher matcher = pattern.matcher(value.toString());
        if (matcher.find()) {
            word.set(matcher.group(0));
            context.write(word, one);
        }
    }
}