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

Question

This question already has an answer here:

Convert escaped Unicode character back to actual character in PostgreSQL (1 answer)

Closed 7 years ago.

I am loading data dump from external source and some strings contain \uXXXX sequences for the UTF8 chars, like this one:

\u017D\u010F\u00E1r nad S\u00E1zavou

I can check the contents by using E'' constant in psql, but cannot find any function/operator to return me proper value.

I'd like to ask, if it's possible to convert this string with unicode escapes into normal UTF8 without using PL/pgSQL functions?

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.