Finding methods, was Re: DSL design (was DSLs in perl and python)

[Peter Otten]

Rustom Mody wrote:

> [How BTW did you folks go about unearth that groupindex?? Dont see it in
> [docs]

While it's there

https://docs.python.org/dev/library/re.html#re.regex.groupindex

my personal search algorithm for this category of questions is mostly "I saw 
something like that before", then dir(some_obj) to find the candidates, then 
try the candidates in order of likelihood. If that fails use the source.

While you learn things you weren't looking for the disadvantage of that 
approach is that you sometimes miss the "obvious, first hit given by the 
search engine" answer.

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Re: DSL design (was DSLs in perl and python)

[Jussi Piitulainen]

Rustom Mody writes:

> [How BTW did you folks go about unearth that groupindex?? Dont see it
> in docs]

The following reveal its existence:

dir(re.compile(""))
help(re.compile(""))

But help only lists it as one of "data descriptors defined here" (in
Python 3.4.3). I think I just guessed from its name that it might be
relevant, and trying it out didn't immediately contradict the guess :)
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Re: DSL design (was DSLs in perl and python)

[Chris Angelico]

On Wed, Mar 30, 2016 at 12:28 AM, Rustom Mody  wrote:
> Thanks once again to Peter and Jussi.
> With that groupindex pointer, this tiny dsl for re's is here
> https://github.com/rusimody/redsl
> [How BTW did you folks go about unearth that groupindex?? Dont see it in docs]

Depending on your version:

https://docs.python.org/2/library/re.html#re.RegexObject.groupindex
https://docs.python.org/3/library/re.html#re.regex.groupindex

You can find that by searching the docs for "?P", the syntax used in
the RE itself.

ChrisA
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