copywriting - What is the correct way to indicate something can be either singular or plural?

Taking it as a given that the system is not intelligent enough to be able to recognise a single result as apposed to multiple results (don't ask!), what is the correct way to represent the possibility of either from a grammatical perspective? I've always taken it as a given that placing an 'S' within brackets is correct, however, someone has suggested this is grammatically incorrect, and that the 'S' should be preceded by a forward slash. e.g.

• 
  

  A.

  
  
  
  
  
  • 1 matching result(s)
  
  
  • 100 matching result(s)
  
  
  
  


• 
  

  or B.

  
  
  
  
  • 1 matching result/s
  
  
  • 100 matching result/s
  
  
  
  
  

As mentioned above, ideally the system would be smart enough to recognise the difference and display the message accordingly (1 matching result, 100 matching results), but until this can be resolved technically we have to answer the problem with content.