Python and Regular Expressions
steve at REMOVE-THIS-cybersource.com.au
Sat Apr 10 21:23:56 EDT 2010
On Sat, 10 Apr 2010 10:11:07 -0700, Patrick Maupin wrote:
> On Apr 10, 11:35 am, Neil Cerutti <ne... at norwich.edu> wrote:
>> On 2010-04-10, Patrick Maupin <pmau... at gmail.com> wrote:
>> > as Pyparsing". Which is all well and good, except then the OP will
>> > download pyparsing, take a look, realize that it uses regexps under
>> > the hood, and possibly be very confused.
>> I don't agree with that. If a person is trying to ski using pieces of
>> wood that they carved themselves, I don't expect them to be surprised
>> that the skis they buy are made out of similar materials.
> But, in this case, the guy ASKED how to make the skis in his woodworking
> shop, and was told not to be silly -- you don't use wood to make skis --
> and then directed to go buy some skis that are, in fact, made out of
As entertaining as this is, the analogy is rubbish. Skis are far too
simple to use as an analogy for a parser (he says, having never seen skis
up close in his life *wink*). Have you looked at PyParsing's source code?
Regexes are only a small part of the parser, and not analogous to the
wood of skis.
Perhaps a better analogy would be a tennis racket, with regexes being the
strings. You have a whole lot of strings, not just one, and they are held
together with a strong framework. Without the framework the strings are
useless, and without the strings the racket doesn't do anything useful.
Using this analogy, I would say the OP was wanting to play tennis with a
single piece of string, and asking for advise on beefing it up to make it
work better. Perhaps a knot tied in one end will help?
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