How get all matching positions in a string?

Question

I have a column flag_acumu in a table in PostgreSQL with values like:

\'SSNSSNNNNNNNNNNNNNNNNNNNNNNNNNNNNSNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN\'         


        

Answer 1

This works too. And a bit faster I think.

create or replace function findAllposition(_pat varchar, _tar varchar) 
returns int[] as
$body$
declare _poslist int[]; _pos int;
begin

_pos := position(_pat in _tar);
while (_pos>0)
loop

    if array_length(_poslist,1) is null then
        _poslist := _poslist || (_pos);
    else
        _poslist := _poslist || (_pos + _poslist[array_length(_poslist,1)] + 1);
    end if;

    _tar := substr(_tar, _pos + 1, length(_tar));
    _pos := position(_pat in _tar);

end loop;
return _poslist;

end;
$body$
language plpgsql;

Will return a position list which is an int array.

{position1, position2, position3, etc.}