accessing iostat -x %b with a scripting language

[Iv Ray]

Is there a standard way to access, with a scripting language (php, perl, 
etc.) the output of -

iostat -x
I am particularly interested in the %b column (HDD utilization).

I am not sure if reading the output and regex-ing the Nth column is the 
right approach, or there is a more intelligent one.

Iv
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