bot_log display fails on Postgres

I'm trying to run bot with a PostgreSQL backend. Visiting the bot/log/ page I get:

PDOException: SQLSTATE[42601]: Syntax error: 7 ERROR: syntax error at or near "REGEXP" LINE 1: SELECT * FROM bot_log WHERE channel REGEXP '#w3( |$)' AND (t... ^: SELECT * FROM {bot_log} WHERE channel REGEXP '#w3( |$)' AND (timestamp >= :date_start AND timestamp <= :date_end) ORDER BY id; Array ( [:date_start] => 1352505600 [:date_end] => 1352592000 ) in bot_log_date() (line 262 of modules/bot/bot_log/bot_log.module).