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--
-- Perl Weekly Challenge 289
-- Task 2
-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-289>
--
CREATE SCHEMA IF NOT EXISTS pwc289;
CREATE OR REPLACE FUNCTION
pwc289.task2_plpgsql( words text[])
RETURNS SETOF text
AS $CODE$
DECLARE
current_word text;
first_index int;
last_index int;
new_word text;
BEGIN
FOREACH current_word IN ARRAY words LOOP
first_index := 1;
last_index := length( current_word );
new_word := substring( current_word from first_index for 1 );
WHILE NOT substring( current_word from last_index for 1 ) ~ '[a-z0-9A-Z]' LOOP
last_index := last_index - 1;
END LOOP;
WITH l AS ( SELECT v::text
FROM regexp_split_to_table( substring( current_word from first_index + 1 for last_index - first_index - 1 ), '' ) v
ORDER BY random() )
SELECT string_agg( l.v, '' )
INTO new_word
FROM l;
RETURN NEXT substring( current_word from first_index for 1 )
|| new_word
|| substring( current_word from last_index );
END LOOP;
RETURN;
END
$CODE$
LANGUAGE plpgsql;
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