You can. The last byte of an emoji is never the same as 'a'. UTF-8 is self-synchronizing, a trailing byte can never be misinterpreted as the start of a new cod

You can. The last byte of an emoji is never the same as 'a'. UTF-8 is self-synchronizing, a trailing byte can never be misinterpreted as the start of a new codepoint. This makes `memmem()` a valid substring search on UTF-8! With most legacy multi-byte encodings this would fail, but with UTF-8 it works!