[Fix #8593] Ignore multi-line interpolations in `Style/RedundantRegex…

…pCharacterClass`

CHANGELOG.md

@@ -31,6 +31,7 @@
 * [#8590](https://github.com/rubocop-hq/rubocop/issues/8590): Fix an error when auto-correcting encoding mismatch file. ([@koic][])
 * [#8321](https://github.com/rubocop-hq/rubocop/issues/8321): Enable auto-correction for `Layout/{Def}EndAlignment`, `Lint/EmptyEnsure`. ([@marcandre][])
 * [#8583](https://github.com/rubocop-hq/rubocop/issues/8583): Fix `Style/RedundantRegexpEscape` false positive for line continuations. ([@owst][])
+* [#8593](https://github.com/rubocop-hq/rubocop/issues/8593): Fix `Style/RedundantRegexpCharacterClass` false positive for interpolated multi-line expressions. ([@owst][])
 
 ### Changes
 

lib/rubocop/cop/mixin/regexp_literal_help.rb

@@ -27,7 +27,7 @@ def source_with_comments_and_interpolations_blanked(child, freespace_mode)
         # part of the pattern source, but need to preserve their width, to allow offsets to
         # correctly line up with the original source: spaces have no effect, and preserve width.
         if child.begin_type?
-          replace_match_with_spaces(source, /.*/) # replace all content
+          replace_match_with_spaces(source, /.*/m) # replace all content
         elsif freespace_mode
           replace_match_with_spaces(source, /(?<!\\)#.*/) # replace any comments
         else

spec/rubocop/cop/style/redundant_regexp_character_class_spec.rb

@@ -224,6 +224,16 @@
     end
   end
 
+  context 'with a multi-line interpolation' do
+    it 'ignores offenses in the interpolated expression' do
+      expect_no_offenses(<<~'RUBY')
+        /#{Regexp.union(
+          %w"( ) { } [ ] < > $ ! ^ ` ... + * ? ,"
+        )}/o
+      RUBY
+    end
+  end
+
   context 'with a character class containing a space' do
     context 'when not using free-spaced mode' do
       it 'registers an offense and corrects' do