Q: what parser generator can do this?

Hi,


I've been looking through a list of parser generators for one to
use, but I never find all the info I need. So can anyone out there
recommend a parser generator that can do all of the following:


- multiple entry points (multiple parsers, shared code)
- supports parameters to rules and local variables (like LLgen)
- error mechanism that enables context specific error messages
    (such as: "bar" expected after "foo")
- generates C or C++ code (Unix environment)


It only needs to parse regular expressions in this case.




Thanks!


Martin

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