Method contains

app/src/main/java/eu/faircode/email/EntityRule.java:1822–1837

(JSONObject jobject, String query)

    }

    private boolean contains(JSONObject jobject, String query) throws JSONException {
        Iterator<String> keys = jobject.keys();
        while (keys.hasNext()) {
            String key = keys.next();
            Object value = jobject.get(key);
            if (value instanceof JSONObject) {
                if (contains((JSONObject) value, query))
                    return true;
            } else {
                if (value.toString().toLowerCase().contains(query))
                    return true;
            }
        }

        return false;
    }

    public JSONObject toJSON() throws JSONException {
        JSONObject json = new JSONObject();