[PLUG] File content modification

[Shreerang Patwardhan]

Hello all,
     I have a file with contents in the following manner:
10001_abc_county
10003_abc_xyz_county
10005_abc_pqr_xyz_county

Each entry is on a new line and each line begins with a number and ends with
the word county!

I wish to convert the contents of this file in the form as specified below:
abc
abcxyz
abcpqrxyz

How do I get around this?
Need help!

Regards,
Shreerang Patwardhan.