file handling

Hi,

I have a file as below.

<some liles> 

(track

 (layer metal1

width 0.1

)

(layer metal2

width 0.2

)

(layer metal3

width 0.3)

 I want to read this file from the beginning.When it will find track word it should check for each layer.If layer is metal1 then execute the lines with in the braces for metal1.Similarly goes for other layers.

Kindly help me writing this code.

Thanks