string package:parsers
string s parses a sequence of characters given by
s.
Returns the parsed string (i.e.
s).
divOrMod = string "div"
<|> string "mod"
This token parser parses a literal string. Returns the literal string
value. This parsers deals correctly with escape sequences and gaps.
The literal string is parsed according to the grammar rules defined in
the Haskell report (which matches most programming languages quite
closely).
This token parser behaves as
stringLiteral, but for
single-quoted strings.