An alternative to flex and bison duo?

Is there any alternative to flex and bison (lex/yacc) combo? Any other tools that let specify a language grammar in BNF?

Solution

A couple of options:

Antlr: http://www.antlr.org/

If you're using C++, Boost::Spirit: http://www.boost.org/doc/libs/1_41_0/libs/spirit/doc/html/index.html

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