How to delete all calendar events which are starting with equal text without deleting other calendar events?

Question

The link "Delete calendar entries" solved my problem deleting all entries in the calendar.
Take a look at the code:

Cursor cursor;
cursor = resolver.query(eventsUri, new String[]{ "_id" }, "calendar_id=" + calendarId, null, null);
while(cursor.moveToNext()) {
        long eventId = cursor.getLong(cursor.getColumnIndex("_id"));
        resolver.delete(ContentUris.withAppendedId(eventsUri, eventId), null, null);
}

But I want to delete only calendar events starting with an equal text in the description column. Notice: The description only starts with an equal text.
I think the problem is at following line:

cursor = resolver.query(eventsUri, new String[]{ "_id" }, "calendar_id=" + calendarId, null, null);

How can I modify the query to return all rows starting with an equal text (e.g. "This was created by ...") in the description column?