How grep with -e (regex) /log/messages ?

Hi,

I would like to display the new lines of /var/log/messages that contain either IN_MyText or OUT_MyText (no matter where in the line)

I've tried

 bash

    
tail -fn 3 /var/log/messages | grep --color --line-buffered -e "(IN|OUT)_MyText"


  

But the output stay blank, when it should not...

Any ideas ?