United States Banking Institution Account Number Regular Expression?

Question

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 reser

Answer 1

In Addition to the other great answers here, i think its helpful to know that routing numbers in the United States include a checksum digit which can be helpful for quick validation that the user typed it in correctly

http://www.brainjar.com/js/validation/

basically all US routing numbers should pass the following test:

3 * (digits[0] + digits[3] + digits[6]) +
7 * (digits[1] + digits[4] + digits[7]) +
(digits[2] + digits[5] + digits[8]) % 10 === 0