text_to_sentences for splitting text into a vector of sentences;  
text_to_chars for splitting text into a vector of characters;  
count_words for counting the frequency of words; 
strsplit for splitting strings.
Other text objects and functions: 
Umlaut,
capitalize(),
caseflip(),
cclass,
count_chars_words(),
count_chars(),
count_words(),
l33t_rul35,
map_text_chars(),
map_text_coord(),
map_text_regex(),
metachar,
read_ascii(),
text_to_chars(),
text_to_sentences(),
transl33t()