regular expression for window title

[test71]

Raj,
when I spy on the window title, I am getting a hierarchy as

Code:

Window("abcd").Window("avenue (Original Stream)")

After this what should I do?I want to use reg expression for avenue (Original Stream),where only 'avenue' text will vary evertime I open new video window.
Can you please suggest me exact expression that I can use for this?

Thanks.