From: duerst@it.aoyama.ac.jp
To: ruby-core@ruby-lang.org
Subject: [ruby-core:69822] [Ruby trunk - Feature #11309] Iterator over string matches
Date: Wed, 01 Jul 2015 01:25:36 +0000 [thread overview]
Message-ID: <redmine.journal-53220.20150701012536.b70a7cef8c5bc67e@ruby-lang.org> (raw)
In-Reply-To: redmine.issue-11309.20150626145543@ruby-lang.org
Issue #11309 has been updated by Martin Dürst.
What do you think looks too Perlish? Is it just the $`?
In that case, having something like $MATCH (as an alias to $~) might help:
"a_b_c_d_e".scan("_").with_object([]) { |_, a| a.push $MATCH.post_match }
Even without that,
"a_b_c_d_e".scan("_").with_object([]) { |_, a| a.push $~.post_match }
is quite readable, because "post_match" makes it easy to understand that $~ must be the current match.
----------------------------------------
Feature #11309: Iterator over string matches
https://bugs.ruby-lang.org/issues/11309#change-53220
* Author: Tsuyoshi Sawada
* Status: Open
* Priority: Normal
* Assignee:
----------------------------------------
This was hinted from a problem in stackoverflow (http://stackoverflow.com/questions/31074050/build-list-of-strings-containing-substrings-separated-by-an-from-a-string/31075511#31075511).
Suppose there is a string:
s = "a_b_c_d_e"
To get an array of pre-matches that result from matching `s` with `"_"`, I can do this:
a = []
s.scan("_"){a.push($`)}
a # => ["a", "a_b", "a_b_c", "a_b_c_d"]
But this looks too Perlish. I thought it would be nice if there is a method on `String` that creates an enumerator over matches so that I can do something like this:
"a_b_c_d_e".some_method("_").with_object([]){|m, a| a.push(m.post_match)}
# => ["a", "a_b", "a_b_c", "a_b_c_d"]
where `m` is the last matchdata instance at that point. I believe such method would have wider application.
--
https://bugs.ruby-lang.org/
next prev parent reply other threads:[~2015-07-01 1:00 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <redmine.issue-11309.20150626145543@ruby-lang.org>
2015-06-26 14:55 ` [ruby-core:69743] [Ruby trunk - Feature #11309] [Open] Iterator over string matches sawadatsuyoshi
2015-06-26 14:58 ` [ruby-core:69744] [Ruby trunk - Feature #11309] " sawadatsuyoshi
2015-07-01 1:25 ` duerst [this message]
2015-07-01 8:35 ` [ruby-core:69824] " sawadatsuyoshi
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