Keyword Highlight for Number Formats

[dlong]

Is there a way to add a keyword which will highlight a string based on this format?

nnn n nn nn

Basically, it is a 3-digit number followed by a space, then a 1-digit number followed by a space, etc.
For those in the telecom world, it is a Nortel/Avaya TN I am hoping to have highlighted automatically in a session.