optimize urlpattern as much as we can (#1035)

Author: anonrig

include/ada/url_pattern-inl.h

@@ -46,10 +46,8 @@ url_pattern_component<regex_provider>::create_component_match_result(
   // says we should start from 1. This case is handled by the
   // std_regex_provider.
   for (size_t index = 0; index < exec_result.size(); index++) {
-    result.groups.insert({
-        group_name_list[index],
-        std::move(exec_result[index]),
-    });
+    result.groups.emplace(group_name_list[index],
+                          std::move(exec_result[index]));
   }
   return result;
 }

src/url_pattern_regex.cpp

@@ -25,11 +25,9 @@ std::optional<std::regex> std_regex_provider::create_instance(
 std::optional<std::vector<std::optional<std::string>>>
 std_regex_provider::regex_search(std::string_view input,
                                  const std::regex& pattern) {
-  std::string input_str(
-      input.begin(),
-      input.end());  // Convert string_view to string for regex_search
-  std::smatch match_result;
-  if (!std::regex_search(input_str, match_result, pattern,
+  // Use iterator-based regex_search to avoid string allocation
+  std::match_results<std::string_view::const_iterator> match_result;
+  if (!std::regex_search(input.begin(), input.end(), match_result, pattern,
                          std::regex_constants::match_any)) {
     return std::nullopt;
   }