In the 3x3 matrix:

 a b c
d e f
g h i
[download]

a, b, c, d and g cannot be zero, so only (combined) numbers which are accepted by the following regex are candidates /[1-9][1-9][1-9][1-9][0-9][0-9][1-9]0-9][0-9]/

This should weed out a bit more numbers than your regex.

CountZero

"If you have four groups working on a compiler, you'll get a 4-pass compiler." - Conway's Law