Use dir with a defined string AND wildcard?

I am trying to search through roughly 2000 .csv files to find the one that matches user input. The user input is in the form of a string, so I have a string 'R' that I want to include in my DIR search. I also want to use the wildcard '*' in the DIR function because the file names are much more complex than the user input 'R'. Is there a way to search my files using both a predefined string 'R' and wildcard? I know I could use a string and wildcard together in the form DIR('*filesearch'), but I want to utilize user input from a GUI rather than have the user go into the code and include their search words explicitly in the DIR function.

Answer 1

[the cyclist]

Is it as simple as

R = 'user_stuff'; % Get this from user input
dir(['*',R])

or maybe

dir(['*',R,'*'])

[Paxton Carnes]

Worked perfectly! I had tried this solution without the brackets, but had the error of too many input arguments. The square brackets made it work though. Thanks!