https://git.ruby-lang.org/ruby.git/commit/?id=7b2cd548aa

From 7b2cd548aa52fa434006dccff62a6050ed5fd881 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sun, 3 Nov 2019 23:18:01 +0900
Subject: [DOC] mentioned `\R` [ci skip]


diff --git a/doc/regexp.rdoc b/doc/regexp.rdoc
index c14a145..ccf8253 100644
--- a/doc/regexp.rdoc
+++ b/doc/regexp.rdoc
@@ -132,6 +132,9 @@ The following metacharacters also behave like character classes: https://github.com/ruby/ruby/blob/trunk/doc/regexp.rdoc#L132
 * <tt>/\H/</tt> - A non-hexdigit character (<tt>[^0-9a-fA-F]</tt>)
 * <tt>/\s/</tt> - A whitespace character: <tt>/[ \t\r\n\f\v]/</tt>
 * <tt>/\S/</tt> - A non-whitespace character: <tt>/[^ \t\r\n\f\v]/</tt>
+* <tt>/\R/</tt> - A linebreak: <tt>\n</tt>, <tt>\v</tt>, <tt>\f</tt>, <tt>\r</tt>
+  <tt>\u0085</tt> (NEXT LINE), <tt>\u2028</tt> (LINE SEPARATOR), <tt>\u2029</tt> (PARAGRAPH SEPARATOR)
+  or <tt>\r\n</tt>.
 
 POSIX <i>bracket expressions</i> are also similar to character classes.
 They provide a portable alternative to the above, with the added benefit
-- 
cgit v0.10.2


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