Get string from file

Hello,

I parse rtf file with powershell, I get also the content to a variable.

This is a part of the content from rtf file:

Now the question:

How did I get only this part - value DEV_test_collection to variable at powershell?

Thanks Horst MOSS 2007 Farm; MOSS 2010 Farm; TFS 2010; IIS 7.5