LibRegex: Account for uppercase characters in insensitive patterns

Author: https://github.com/alimpfard
Commit: 5b45223d5f
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/5403
Reviewed-by: https://github.com/gmta ✅

Libraries/LibRegex/RegexParser.h

@@ -66,6 +66,7 @@ public:
             Optional<ByteString> pure_substring_search;
             // If populated, the pattern only accepts strings that start with a character in these ranges.
             Vector<CharRange> starting_ranges;
+            Vector<CharRange> starting_ranges_insensitive;
             bool only_start_of_line = false;
         } optimization_data {};
     };