I've let this run a few days but I'm still having trouble with this pattern. I made a small change to it by adding the * after all the speed entries and added speeds but the lines still get flagged.
Here's the way it is now: [ \t\r\n\v\f]*speed\s(300|1200|19200|38400|57600|115200)*[ \t\r\n\v\f]*
