regexp included '\t' does not work properly

logrt with regexp parameter include '\t' dose not work.
For example, in log file:
2016-06-20 10:00:00\tERROR\tError message
2016-06-20 10:00:00\tINFO\tError message
regexp pattern:
^[0-9- :]\tERROR

logrt["/path/to/logfile", "^[0-9- :]\tERROR"]

I expect that Error log only recorded to history_log table. But no log is recorded.