From: leo@...
Date: 2016-10-22T22:59:09+00:00
Subject: [ruby-core:77718] [Ruby trunk Bug#12862] Regular Expression Named Group Matching does not work with #{} (Similar? to issue #2778)

Issue #12862 has been updated by Leo Amigud.


Hans Mackowiak wrote:
> it did took me a while to understand what you mean, because the regexp are displayed wrong.
> 
> "When named capture groups are used with a literal regexp on the left-hand side of an expression and the =~ operator, the captured text is also assigned to local variables with corresponding names."
> 
> it might not be good explained, but that literal regexp can not have interpolation for that to work.

Sorry, not sure what you mean.

As a matter of fact i can use regexp like:

irb(main):013:0> numbers = '\d+'
=> "\\d+"
irb(main):014:0> /\$#{numbers}.\d+/ =~ "$3.67"
=> 0
irb(main):015:0>

to match the string, but using #{numbers} inside the named group somehow does not work.

Is that the expected behaviour?

Leo


----------------------------------------
Bug #12862: Regular Expression Named Group Matching does not work with #{} (Similar? to issue #2778)
https://bugs.ruby-lang.org/issues/12862#change-61001

* Author: Leo Amigud
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.3.1p112 (2016-04-26 revision 54768) [x86_64-linux]
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
----------------------------------------
Loading development environment (Rails 4.2.5)
irb(main):001:0> /\$(?<dollars>\d+)\.(?<cents>\d+)/ =~ "$3.67"
=> 0
irb(main):002:0> dollars
=> "3"


BUT:
irb(main):001:0> numbers = '\d+'
=> "\\d+"
irb(main):002:0> /\$(?<dollars>#{numbers})\.(?<cents>\d+)/ =~ "$3.67"
=> 0
irb(main):003:0> dollars
NameError: undefined local variable or method `dollars' for main:Object



-- 
https://bugs.ruby-lang.org/

Unsubscribe: <mailto:ruby-core-request@ruby-lang.org?subject=unsubscribe>
<http://lists.ruby-lang.org/cgi-bin/mailman/options/ruby-core>