How to convert literal \u sequences into UTF-8? [duplicate]

Answer 1

I don't think there is a built in method for that. Easiest way I can think of is the plpgsql function you wanted to avoid:

CREATE OR REPLACE FUNCTION str_eval(text, OUT t text)
  LANGUAGE plpgsql IMMUTABLE STRICT PARALLEL SAFE AS
$func$
BEGIN
   EXECUTE 'SELECT E''' || replace($1, '''', '''''') || ''''
   USING $1
   INTO t;
END
$func$;

The updated version safeguards against SQLi and is faster, too.