/usr/share/postgresql/10/extension/citext--1.3--1.4.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 | /* contrib/citext/citext--1.3--1.4.sql */
-- complain if script is sourced in psql, rather than via ALTER EXTENSION
\echo Use "ALTER EXTENSION citext UPDATE TO '1.4'" to load this file. \quit
CREATE FUNCTION regexp_match( citext, citext ) RETURNS TEXT[] AS $$
SELECT pg_catalog.regexp_match( $1::pg_catalog.text, $2::pg_catalog.text, 'i' );
$$ LANGUAGE SQL IMMUTABLE STRICT PARALLEL SAFE;
CREATE FUNCTION regexp_match( citext, citext, text ) RETURNS TEXT[] AS $$
SELECT pg_catalog.regexp_match( $1::pg_catalog.text, $2::pg_catalog.text, CASE WHEN pg_catalog.strpos($3, 'c') = 0 THEN $3 || 'i' ELSE $3 END );
$$ LANGUAGE SQL IMMUTABLE STRICT PARALLEL SAFE;
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