fn split<'a>(lexicon: &Lexicon, text: &'a str) -> Vec<&'a str>Expand description
The words of the text: runs of letters, digits and underscores; a dot or a
comma between two of them kept (“2.5”, “1,000”, “e.g”), an apostrophe
between two letters (“don’t”, “aujourd’hui”); French elisions split off
and dropped (“l’information”, “qu’il”: Lexicon::elisions).