Any equivalent of sys.dbms_xmlgen.convert(varchar2,Number) of oracle in postgresql? Because postgresql doesnot support this function

Question

WITH x AS (SELECT DBMS_XMLGEN.CONVERT(REGEXP_REPLACE(iText, \'(#[[:digit:]]+;)\', \'\\1\'), 1) AS message FROM DUAL) SELECT UTL_I18N.UNESCAPE_REFERENCE(message)into iText2 f