Task 1 plpgsql

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+--
+-- Perl Weekly Challenge 216
+-- Task 1
+--
+-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-216/>
+--
+
+CREATE SCHEMA IF NOT EXISTS pwc216;
+
+CREATE OR REPLACE FUNCTION
+pwc216.task1_plpgsql( rc text, strings text[] )
+RETURNS SETOF TEXT
+AS $CODE$
+DECLARE
+	current_word text;
+	matches int;
+BEGIN
+	FOREACH current_word IN ARRAY strings LOOP
+	    SELECT count(*)
+	    INTO matches
+	    FROM regexp_split_to_table( rc, '' ) r
+	    , regexp_split_to_table( current_word, '' ) w
+	    WHERE r = w;
+
+	    IF matches = length( current_word ) THEN
+	       RETURN NEXT current_word;
+	    END IF;
+	END LOOP;
+
+RETURN;
+END
+$CODE$
+LANGUAGE plpgsql;