Interchange Reference Pages: Checks

For a complete introduction to Interchange form field checks, please see the order check glossary entry.

Table of Contents

always_fail — always fail
always_pass — always pass
email_only — e-mail address is syntactically correct
exists — record exists in a database table
filter — value passes through specified filter unmodified
future — date is a future date
isbn — string is a valid ISBN-10/ISBN-13 code
length — string is within specified length limits
match — CGI value matches another CGI value
natural — number is a natural number
regex — value matches regular expression
relative_filename — value qualifies as relative filename
unique — record doesn't exist in a database table

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