How would you validate a bank routing number field that must contain nine digits?

To ensure that a bank routing number field is validated to contain exactly nine digits, implementing an edit validate rule for the pattern is the most effective approach. This method allows you to define a specific format that the input must adhere to, in this case, a sequence of nine digits.

By using an edit validate rule, you can create a validation check that enforces not only the length requirement but also the specific numeric nature of the input. This rule evaluates the data when it is entered and provides immediate feedback if the input does not match the required pattern, ensuring that the users are alerted to errors in real-time.

Using a numeric input field is helpful for restricting input to only numbers but does not inherently validate the length requirement. Setting a character limit in field properties also restricts the number of characters but does not enforce the rule that those characters must be digits or that there must be exactly nine digits. A dynamic layout is more concerned with the organizational presentation of fields, rather than their validation.

Therefore, implementing an edit validate rule for the pattern is the most comprehensive and effective strategy for ensuring the integrity of the bank routing number input.