通配符掩码：例如，帐目编码必须由两个字母加任意数量的数字组成。

Wild card masks: For example, an account number must have two alphas followed by any number of numerics.

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数据长度：例如，帐目编码必须具备指定长度、最小长度或者最大长度。

Data length: For example, an account number must have a particular string length, a minimum string length, or a maximum string length.

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