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Perl Programming Language

FAQ 7.1 Can I get a BNF/yacc/RE for the Perl language?


This is an excerpt from the latest version perlfaq7.pod, which
comes with the standard Perl distribution. These postings aim to
reduce the number of repeated questions as well as allow the community
to review and update the answers. The latest version of the complete
perlfaq is at http://faq.perl.org .

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7.1: Can I get a BNF/yacc/RE for the Perl language?

    There is no BNF, but you can paw your way through the yacc grammar in
    perly.y in the source distribution if you're particularly brave. The
    grammar relies on very smart tokenizing code, so be prepared to venture
    into toke.c as well.

    In the words of Chaim Frenkel: "Perl's grammar can not be reduced to
    BNF. The work of parsing perl is distributed between yacc, the lexer,
    smoke and mirrors."

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The perlfaq-workers, a group of volunteers, maintain the perlfaq. They
are not necessarily experts in every domain where Perl might show up,
so please include as much information as possible and relevant in any
corrections. The perlfaq-workers also don't have access to every
operating system or platform, so please include relevant details for
corrections to examples that do not work on particular platforms.
Working code is greatly appreciated.

If you'd like to help maintain the perlfaq, see the details in
perlfaq.pod.

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