/usr/share/postgresql/10/extension/citext--1.0--1.1.sql is in postgresql-10 10.6-0ubuntu0.18.04.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | /* contrib/citext/citext--1.0--1.1.sql */
-- complain if script is sourced in psql, rather than via ALTER EXTENSION
\echo Use "ALTER EXTENSION citext UPDATE TO '1.1'" to load this file. \quit
/* First we have to remove them from the extension */
ALTER EXTENSION citext DROP FUNCTION regexp_matches( citext, citext );
ALTER EXTENSION citext DROP FUNCTION regexp_matches( citext, citext, text );
/* Then we can drop them */
DROP FUNCTION regexp_matches( citext, citext );
DROP FUNCTION regexp_matches( citext, citext, text );
/* Now redefine */
CREATE FUNCTION regexp_matches( citext, citext ) RETURNS SETOF TEXT[] AS $$
SELECT pg_catalog.regexp_matches( $1::pg_catalog.text, $2::pg_catalog.text, 'i' );
$$ LANGUAGE SQL IMMUTABLE STRICT ROWS 1;
CREATE FUNCTION regexp_matches( citext, citext, text ) RETURNS SETOF TEXT[] AS $$
SELECT pg_catalog.regexp_matches( $1::pg_catalog.text, $2::pg_catalog.text, CASE WHEN pg_catalog.strpos($3, 'c') = 0 THEN $3 || 'i' ELSE $3 END );
$$ LANGUAGE SQL IMMUTABLE STRICT ROWS 10;
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