To find a value in atext file using powershell

Hi All,

i have a VB script which help me in downloading the text file(mail attachment) to my local drive from outlook.i want to check some values in the text file. for ex

A
date1 count count miss
2/25/2014 42 42 0

B
date2 count count miss
2/25/2014 78 78 0

i want to check weather the value in "miss" is 0. please help me with this