def subStringMatchExact(target, key):
    if len(target) == 0:
        return ()
    if len(key) == 0:
        return tuple(range(0, len(target)))
    current_search_start = 0
    starting_pos =()
    while current_search_start < len(target):
        found_pos = str.find(target, key, current_search_start)
        if found_pos >= 0:
            starting_pos = starting_pos + (found_pos,)
            current_search_start = found_pos + len(key)
        else:
            break
    return starting_pos