title: c# - check if string contains character and number
body: <p>How do I check if a string contains the following characters "-A" followed by a number?</p>
  
  <p>Ex: thisIsaString-A21  = yes, contains "-A" followed by a number</p>
  
  <p>Ex: thisIsaNotherString-AB21 = no, does not contain "-A" followed by a number</p>