busca la a la a la a
busca la a la a la a !
β u s k a WORD_BOUNDARY l a WORD_BOUNDARY a WORD_BOUNDARY l a WORD_BOUNDARY a WORD_BOUNDARY l a WORD_BOUNDARY a WORD_BOUNDARY
b u s c a WORD_BOUNDARY l a WORD_BOUNDARY a WORD_BOUNDARY l a WORD_BOUNDARY a WORD_BOUNDARY l a WORD_BOUNDARY a WORD_BOUNDARY ! WORD_BOUNDARY