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--
-- Perl Weekly Challenge 329
-- Task 2
-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-329>
--
CREATE SCHEMA IF NOT EXISTS pwc329;
CREATE OR REPLACE FUNCTION
pwc329.task2_plpgsql( s text )
RETURNS text
AS $CODE$
DECLARE
current text;
i int;
chars text[];
result text;
tmp text;
needle text;
BEGIN
SELECT regexp_split_to_array( s, '' )
INTO chars;
result := '';
FOR i in 1 .. length( s ) LOOP
current := chars[ i ];
needle := upper( current );
IF current ~ '[A-Z]' THEN
needle := lower( current );
END IF;
tmp := '';
FOR j IN i .. length( s ) LOOP
IF chars[ j ] = needle THEN
tmp := array_to_string( chars[ i : j ], '' );
IF length( tmp ) > length( result ) THEN
result := tmp;
END IF;
END IF;
END LOOP;
END LOOP;
RETURN result;
END
$CODE$
LANGUAGE plpgsql;
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