With further research I found Microsoft's MSDN page about Regular Expressions (Visual Studio) @ http://msdn.microsoft.com/en-us/library/2k3te2cs.aspx
Through a little trial and error, I found this pattern (based on my posted example); +^report1.+xls$ [ + to include this namefile, ^ to anchor to the start of the line, report1 is my first part of the search string, .+ matches at least one or more characters between the two strings, xls is the second part of the string, and $ to anchor xls to the end of the line ].