title: C# Check if input is in the Pattern of A<INTEGER>
body: <p>Possible input :</p>
  
  <p>1) ASDF-123-ZXCV-456</p>
  
  <p>2) YUIO-123-BNNM-987</p>
  
  <p>3) QWER-123-LKJH-111</p>
  
  <p>4) A1234</p>
  
  <p>5) A456</p>
  
  <p>I  need find the input that matches a Pattern of  Axxx(integer), in this case,either 4) or 5) should be returned..</p>
  
  <p>I tried startWith("A"), but  1) still returns since it also starts with A, but i don't want that</p>
  
  <p>Thanks in advance</p>