Re: [PATCH 2/2] Add reference to the lack of "non-greedy" variants

["Diogo F. S. Ramos" <dfsr@riseup.net>]

> "Diogo F. S. Ramos" <dfsr@riseup.net> writes:
>
>> While describing special characters, remind the reader that
>> "non-greedy" variants are not supported.  They might not be familiar
>> with POSIX extended regular expression and expect it to work.
>
> Going by that logic, might they not expect a lot more?  (Say, if all
> they know about regexps is PCRE, for example.)  Intuition says that it's
> enough to specify "POSIX extended regular expressions", because they're
> a very clearly defined type of regexp.  (Don't be fooled by the word
> "extended", POSIX rigorously defines a type of regexp called "extended
> regular expressions", aka ERE.)

The documentation is already pointing out that some characters are
special, so adding the "non-greedy" observation is not special in this
case and IMO it's an expected feature from regexps.

Your observation makes me think I didn't go far enough.  If users expect
Perl regexps, we should warn them that Guile's is not.

Ultimately, I think Guile should document its own regexp syntax.


These changes have been inspired by the article "Teach, Don't Tell" [1],
and its accompanying texts.  Someone posted it at #guile, but I can't
remember their name now, I'm sorry.

[1]  http://stevelosh.com/blog/2013/09/teach-dont-tell/