Network.Parser.Rfc2234
vchar_pred
bit_pred
alpha_pred
loalpha_pred
upalpha_pred
char_pred
ctl_pred
dquote_pred
digit_pred
hexdig_pred
ht_pred
lf_pred
sp_pred
wsp
vchar
sp
octet
lwsp
lf
ht
hexdig
digit
dquote
ctl
crlf
cr
char
bit
upalpha
loalpha
alpha
manyN
manyNtoM