dubidubidubidubidu bidudubidubidubidubidu
dubidubidubidubidu bidudubidubidubidubidu .
d u b i d u b i d u b i d u b i d u WORD_BOUNDARY b i d u d u b i d u b i d u b i d u b i d u WORD_BOUNDARY
d u b i d u b i d u b i d u b i d u WORD_BOUNDARY b i d u d u b i d u b i d u b i d u b i d u WORD_BOUNDARY . WORD_BOUNDARY