Introduction - If you have any usage issues, please Google them yourself
Full support for extended regular expressions (those with
intersection and complement); Support for some kinds of cycles in
grammar; DFA-based operation; Unicode support; C only, requires a
modern compiler; Lexical analyzers can be configured to get symbols
from any input class (built-in support for std::istream, std::wistream
and FILE*); Designed to work with Whale, but can work standalone or
interface to other parsers.