sitescope script monitor:

I have a sh script in linux to fetch the cpu usage based on a pid.
$ ps aux | grep 6935 | grep -v grep| awk '{print $3}'
The script is working fine at the linux box and gives
1.1 % as result (example)
Referring that in the script monitor with regular expression:

and match value of "CPU"
But am getting CPU=n/a as output..

Tried all possibliites..
Thanks for any input