REGEXP is not a valid PostgreSQL construct

I'm using Postgres 8.3.1

After installing some modules, i have this message:

warning: pg_query() [function.pg-query]: Query failed: ERROR: syntax error at or near "REGEXP" at character 942 in /var/www/drupal-prod/includes/database.pgsql.inc on line 138.
user warning: ERROR: syntax error at or near "REGEXP" at character 942 query: ( SELECT m.load_functions, m.to_arg_functions, m.access_callback, m.access_arguments, m.page_callback, m.page_arguments, m.title, m.title_callback, m.title_arguments, m.type, ml.* FROM menu_links ml LEFT JOIN menu_router m ON m.path = ml.router_path WHERE ml.menu_name = 'navigation' AND ml.plid IN (1, 10, 17, 16, 18, 21, 40) ) UNION ( SELECT m.load_functions, m.to_arg_functions, m.access_callback, m.access_arguments, m.page_callback, m.page_arguments, m.title, m.title_callback, m.title_arguments, m.type, ml.menu_name, ml.mlid + 100000 as mlid, ml.plid, ml.link_path, ml.router_path, m.title as link_title, ml.options, ml.module, ml.hidden, ml.external, ml.has_children, ml.expanded, ml.weight, ml.depth + 1 as depth, ml.customized, ml.p1, ml.p2, ml.p3, ml.p4, ml.p5, ml.p6, ml.p7, ml.p8, ml.p9, ml.updated FROM menu_router m LEFT JOIN menu_links ml ON ml.router_path = m.tab_parent WHERE ml.router_path REGEXP '[^%]*' AND m.path LIKE 'admin/%' AND m.type IN (128,136) ) ORDER BY p1 ASC, p2 ASC, p3 ASC, p4 ASC, p5 ASC, p6 ASC, p7 ASC, p8 ASC, p9 ASC in /var/www/drupal-prod/sites/all/modules/admin_menu/admin_menu.inc on line 92.

Don't know if have to do anything with this http://drupal.org/node/220064

Thks