OnClickListener listenerRegexThread = new OnClickListener() {
    @Override
    public void onClick(View view) {
        /* Run 10 threads for 120 seconds */
        int NUM_THREADS = 10, RUNNING_TIME = 120;
        for(int i = 0; i < 2; ++i){
            new RegexThread();
        }
        try {
            Thread.sleep(1000*RUNNING_TIME);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
};
findViewById(R.id.startRegex).setOnClickListener(listenerRegexThread);