A character code is the representation in numeric form of a particular character mapping from numeric to a particular character.

字符代码是特殊字符的一种数值形式，将数值映射为一个特殊字符。

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Countries have regions, identified by a (usually numeric) code, unique only within the country, and with a name.

国家包含地区，地区由一个编码标识(编码常常是数字的，在这个国家内是惟一的)，还有一个名称。

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Rather than split the numeric sequence into individual digits and write complex code, a regex can test for validity.

regex不会把数字序列分隔为单个数字并编写复杂的代码，而是会测试其有效性。

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To gain entry and traverse interior doors, you must flash a smartcard and punch in a numeric code.

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