AK+Everywhere: Consolidate String::index_of() and String::find()

We had two functions for doing mostly the same thing. Combine both
of them into String::find() and use that everywhere.

Also add some tests to cover basic behavior.

1 files changed, 2 insertions, 2 deletions

diff --git a/Userland/Libraries/LibWeb/Loader/Resource.cpp b/Userland/Libraries/LibWeb/Loader/Resource.cpp
index 09ebeafe9c..0b75b8f886 100644
--- a/Userland/Libraries/LibWeb/Loader/Resource.cpp
+++ b/Userland/Libraries/LibWeb/Loader/Resource.cpp
@@ -43,7 +43,7 @@ void Resource::for_each_client(Function<void(ResourceClient&)> callback)
 
 static Optional<String> encoding_from_content_type(const String& content_type)
 {
-    auto offset = content_type.index_of("charset=");
+    auto offset = content_type.find("charset="sv);
     if (offset.has_value()) {
         auto encoding = content_type.substring(offset.value() + 8, content_type.length() - offset.value() - 8).to_lowercase();
         if (encoding.length() >= 2 && encoding.starts_with('"') && encoding.ends_with('"'))
@@ -58,7 +58,7 @@ static Optional<String> encoding_from_content_type(const String& content_type)
 
 static String mime_type_from_content_type(const String& content_type)
 {
-    auto offset = content_type.index_of(";");
+    auto offset = content_type.find(';');
     if (offset.has_value())
         return content_type.substring(0, offset.value()).to_lowercase();