Oracle SQL query to search all source code for the given :search_text

oracle_source_search.sql

WITH p AS ( SELECT lower('%' || :search_text || '%') as pattern FROM dual )
SELECT
    name, type, line, text
FROM
    (   SELECT name AS name, type AS type, line AS line, text AS text
        FROM   user_source join p on lower(text) like p.pattern
      UNION ALL
        SELECT view_name, 'VIEW', 0, text_vc
        FROM   user_views join p on lower(text_vc) like p.pattern
      UNION ALL
        SELECT table_name, 'TABLE', 0, table_name || '.' || column_name
        FROM   all_tab_columns join p on lower(table_name || '.' || column_name) like p.pattern
    )
ORDER BY name, type, line;