https://git.ruby-lang.org/ruby.git/commit/?id=b08c1bea36

From b08c1bea3632062d0689affac4e0e78523349af0 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Thu, 30 Jan 2020 12:08:37 +0900
Subject: [ruby/irb] Unnamed groups are not captured when named groups are used

https://github.com/ruby/irb/commit/0a641a69b0

diff --git a/lib/irb/completion.rb b/lib/irb/completion.rb
index 7277bf5..c44aa90 100644
--- a/lib/irb/completion.rb
+++ b/lib/irb/completion.rb
@@ -148,7 +148,7 @@ module IRB https://github.com/ruby/ruby/blob/trunk/lib/irb/completion.rb#L148
           select_message(receiver, message, candidates, sep)
         end
 
-      when /^(?<num>-?(0[dbo])?[0-9_]+(\.[0-9_]+)?(([eE][+-]?[0-9]+)?i?|r)?)(?<sep>\.|::)(?<mes>[^.]*)$/
+      when /^(?<num>-?(?:0[dbo])?[0-9_]+(?:\.[0-9_]+)?(?:(?:[eE][+-]?[0-9]+)?i?|r)?)(?<sep>\.|::)(?<mes>[^.]*)$/
         # Numeric
         receiver = $~[:num]
         sep = $~[:sep]
-- 
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