How can I use findstr and/or for loops to select particular columns within a string

I have a file (directorylist.txt) that contains the following lines:

141228-0010

141231-0004

150102-0110

150106-0015

150107-0003

150201-0007

The first 6 digits are a date (YYMMDD)

I need a way to list only the lines that match a variable corresponding with the month column MM. For example.. I have a variable %month% that equals 01. I need a file that shows:

150102-0110

150106-0015

150107-0003

I would like to make this happen using a windows batch script. Is there any way to use findstr or for loops? Other options like powershell?

Solution

findstr /r /b "..%month%" directorylist.txt

should work for you, if there are no other conditions you've not revealed.