title: r find matching file for multiple condition
body: <p>I have read a few posts here for file matching, but my questions is not exactly the same. </p>
  
  <p>I am trying to find the file matching 3 conditions, and all 3 condition is a value of another 3 variable within loop, so looks like I can not directly put the variable in the pattern statement</p>
  
  <p>Here is the example</p>
  
  <pre><code>c1 = "Curr Month"
  c2 = "Entity Lst Yr"
  c3 = "36008"
  file_from = "my_path/"
  
  f = list.files(path = paste0(file_from, "Account/"), pattern = glob2rx(c1*c2*c3))
  </code></pre>
  
  <p>and my error msg is in the pattern statement</p>
  
  <blockquote>
    <p>non-numeric argument to binary operator</p>
  </blockquote>
  
  <p>Any idea is highly appreciated, thank you so much!</p>