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From: Larry Martell <larry.martell@gmail.com>
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Subject: Re: Regular expressions
Date: Fri, 6 Nov 2015 15:42:47 -0500
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On Fri, Nov 6, 2015 at 3:36 PM, Christian Gollwitzer <auriocus@gmx.de> wrote:
> Am 06.11.15 um 20:52 schrieb rurpy@yahoo.com:
>>
>> I have always thought lexing
>> and parsing solutions for Python were a weak spot in the Python eco-
>> system and I was about to write that I would love to see a PEG parser
>> for python when I saw this:
>>
>> http://fdik.org/pyPEG/
>>
>> Unfortunately it suffers from the same problem that Pyparsing, Ply
>> and the rest suffer from: they use Python syntax to express the
>> parsing rules rather than using a dedicated problem-specific syntax
>> such as you used to illustrate peg parsing:
>>
>>> pattern <- phone_number name phone_number
>
>>> phone_number <- '+' [0-9]+ ( '-' [0-9]+ )*
>>> name <-  [[:alpha:]]+
>
> That is actually real syntax of a parser generator used by me for another
> language (Tcl). A calculator example using this package can be found here:
> http://wiki.tcl.tk/39011
> (actually it is a retargetable compiler in a few lines - very impressive)

Ah, Tcl - I wrote many a Tcl script back in the 80s to login to BBSs.