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Unless the business will allow updating "bad" regexes on a daily basis and support someone to research new attacks regularly, this approach will be obviated before long.Rather than accept or reject input, another option is to change the user input into an acceptable format Any characters which are not part of an approved list can be removed, encoded or replaced.There are four strategies for validating data, and they should be used in this order: This strategy is also known as "whitelist" or "positive" validation.The idea is that you should check that the data is one of a set of tightly constrained known good values. Data should be: This strategy, also known as "negative" or "blacklist" validation is a weak alternative to positive validation.

Business rules are known during design, and they influence implementation.

Some documentation and references interchangeably use the various meanings, which is very confusing to all concerned.

This confusion directly causes continuing financial loss to the organization.

int payee Lst Id = Parameter('payeelstid'); account From = Acct Number By Index(payee Lst Id); Not only is this easier to render in HTML, it makes validation and business rule validation trivial. To provide defense in depth and to prevent attack payloads from trust boundaries, such as backend hosts, which are probably incapable of handling arbitrary input data, business rule validation is to be performed (preferably in workflow or command patterns), even if it is known that the back end code performs business rule validation.

This is not to say that the entire set of business rules need be applied - it means that the fundamentals are performed to prevent unnecessary round trips to the backend and to prevent the backend from receiving most tampered data.

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