para	       := (plain / markup)+
plain 	       := (word / whitespace / punctuation)+
whitespace     := [ \t\r\n]+
alphanums      := [a-zA-Z0-9]+
word   	       := alphanums, (wordpunct, alphanums)*, contraction?
wordpunct      := [-_]
contraction    := "'", ('am'/'clock'/'d'/'ll'/'m'/'re'/'s'/'t'/'ve')
markup	       := emph / strong / module / code / title
emph	       := '-', plain, '-'
strong	       := '*', plain, '*'
module	       := '[', plain, ']'
code	       := "'", plain, "'"
title	       := '_', plain, '_'
punctuation    := (safepunct / mdash)
mdash	       := '--'
safepunct      := [!@#$%^&()+=|\{}:;<>,.?/"]