Try/catch input sanitization

Posting.cs

@@ -83,8 +83,12 @@ public class Posting
             }
             i++;
         }
-        Regex boxRegex = new Regex(@"(Box \d+)");
-        this.BoxNumber = boxRegex.Matches(this.NotesOnApplying)[0].Value.Replace("Box ", "");
+        try
+        {
+            Regex boxRegex = new Regex(@"(Box \d+)");
+            this.BoxNumber = boxRegex.Matches(this.NotesOnApplying)[0].Value.Replace("Box ", "");
+        }
+        catch (Exception) { }
         this.BargainingUnit = this.BargainingUnit.Replace("&", "&");
         this.VacancyID = id;
     }