Support highlighting Regexp in inspect

lib/irb/color.rb

@@ -28,8 +28,8 @@ module IRB # :nodoc:
       on_kw:              [[GREEN],                 [Ripper::EXPR_CLASS, Ripper::EXPR_BEG, Ripper::EXPR_END, Ripper::EXPR_FNAME]],
       on_label:           [[MAGENTA],               [Ripper::EXPR_LABELED]],
       on_qwords_beg:      [[RED],                   [Ripper::EXPR_BEG]],
-      on_regexp_beg:      [[RED],                   [Ripper::EXPR_BEG]],
-      on_regexp_end:      [[RED],                   [Ripper::EXPR_BEG]],
+      on_regexp_beg:      [[RED, BOLD],             [Ripper::EXPR_BEG]],
+      on_regexp_end:      [[RED, BOLD],             [Ripper::EXPR_BEG]],
       on_symbeg:          [[BLUE, BOLD],            [Ripper::EXPR_FNAME]],
       on_tstring_beg:     [[RED],                   [Ripper::EXPR_BEG, Ripper::EXPR_END, Ripper::EXPR_ARG, Ripper::EXPR_CMDARG]],
       on_tstring_content: [[RED],                   [Ripper::EXPR_BEG, Ripper::EXPR_ARG, Ripper::EXPR_CMDARG]],
@@ -47,7 +47,7 @@ module IRB # :nodoc:
           obj.all? { |k, v| inspect_colorable?(k) && inspect_colorable?(v) }
         when Array
           obj.all? { |o| inspect_colorable?(o) }
-        when String, Symbol, Integer, Float, FalseClass, TrueClass, NilClass
+        when String, Symbol, Regexp, Integer, Float, FalseClass, TrueClass, NilClass
           true
         else
           false

test/irb/test_color.rb

@@ -23,6 +23,7 @@ module TestIRB
         "def self.foo; bar; end" => "#{GREEN}def#{CLEAR} #{CYAN}#{BOLD}self#{CLEAR}.#{BLUE}#{BOLD}foo#{CLEAR}; bar; #{GREEN}end#{CLEAR}",
         'ERB.new("a#{nil}b", trim_mode: "-")' => "#{BLUE}#{BOLD}#{UNDERLINE}ERB#{CLEAR}.new(#{RED}\"#{CLEAR}#{RED}a#{CLEAR}#{RED}\#{#{CLEAR}#{CYAN}#{BOLD}nil#{CLEAR}#{RED}}#{CLEAR}#{RED}b#{CLEAR}#{RED}\"#{CLEAR}, #{MAGENTA}trim_mode:#{CLEAR} #{RED}\"#{CLEAR}#{RED}-#{CLEAR}#{RED}\"#{CLEAR})",
         "# comment" => "#{BLUE}#{BOLD}# comment#{CLEAR}",
+        '/r#{e}g/' => "#{RED}#{BOLD}/#{CLEAR}#{RED}r#{CLEAR}#{RED}\#{#{CLEAR}e}#{RED}g#{CLEAR}#{RED}#{BOLD}/#{CLEAR}",
       }.each do |code, result|
         assert_equal(result, with_term { IRB::Color.colorize_code(code) })
       end
@@ -34,6 +35,7 @@ module TestIRB
         2.3 => true,
         ['foo', :bar] => true,
         { a: 4 } => true,
+        /reg/ => true,
         Object.new => false,
         Struct.new(:a) => false,
         Struct.new(:a).new(1) => false,