input validation rule
Computing term for a rule that checks whether user input meets certain criteria before it is accepted.
Input validation rules are set for this form.
An error message is displayed if the input validation rule is violated.
バリデーション is a broader loanword for validation in general, while 入力規則 specifically refers to rules applied to user input in computing contexts.
Compound of 入力 (input) and 規則 (rule). A straightforward technical term.