title: United States Banking Institution Account Number Regular Expression?
body: <p>I have been tasked to "verify" the length of a U.S. Banking Institution ACCOUNT NUMBER for a web app I'm developing. I cannot find anything through SOF, Google, Fed reserve etc that outlines an account number standard length that we have in the United States. For the record I believe this is futile.</p>
  
  <p>If someone could point me to any official documentation on the web, or has an example regular expression, or knows if there is a standard that exists, I would appreciate it greatly.</p>
  
  <p>ADDED:</p>
  
  <p>What would interest me even more since the response is overwhelming that their is no standard....has anyone ever run into a bank account number that is not completely "numeric"\</p>
  
  <p>ADDED:</p>
  
  <p>Thanks to everyone and their responses.  Due to having no standard in the US, we are not going to enforce a length check, and we are going to store the number as a varchar due to the fact that it may be possible that a bank may assign alpha characters in their account numbers. Seems 99.999999% unrealistic in our view, but no standard means we will accept alpha characters and run the check on the account number to verify if it works or not. Thanks again all!</p>