From: "nobu (Nobuyoshi Nakada)" <nobu@...>
Date: 2013-08-01T10:24:38+09:00
Subject: [ruby-core:56293] [ruby-trunk - Feature #8714] Non-interpolated regular expression literal


Issue #8714 has been updated by nobu (Nobuyoshi Nakada).


For other %-literals, upper cases do interpolation, e.g., %Q, %W, %I.
I'm afraid that it would cause confusion by making %R exceptional.
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Feature #8714: Non-interpolated regular expression literal
https://bugs.ruby-lang.org/issues/8714#change-40784

Author: phluid61 (Matthew Kerwin)
Status: Open
Priority: Normal
Assignee: 
Category: core
Target version: 


=begin

I propose a new %string for non-interpolated regexp literals: %R

It is common to see erroneous bug reports around the use of ((%#%)) in regexp literals, for example where (({/[$#]/})) raises a syntax error "unexpected $undefined", and this confuses people.  The only solution is to rearrange the regular expression (such as (({/[$#]/}))), which is not always desirable.

An non-interpolated regexp, such as (({%R/[$#]/})), would allow a much simpler resolution.

=== Known Issues

* the capitalisation is the opposite of %Q(interpolated) and %q(uninterpolated)
* %R was also proposed for literal Rationals in #8430, although I believe this has been superseded by the (({1.2r})) syntax

=end



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