alphanumeric

音标发音

This identifier may be a character string, numeric, or alphanumeric value.
这个标识符可以是字符串、数字或字母数字值。
The @ is just that, meaning it must appear after at least one alphanumeric character for the whole pattern to succeed.
@ 就是意味着它必须出现在至少一个字母数字字符之后，这样整个模式匹配才能成功。
The user name should consist of alphanumeric characters and be a valid structure for all systems within an organization so that each person only has one user name.
用户名应该由字母数字字符组成，并且对于组织内部所有的系统都应该是有效的结构，以便每个人只使用一个用户名。

But at this meeting, it is in danger of being upstaged by another alphanumeric entity, U2.
ECONOMIST: Inviting China to dinner
As you can tell from its alphanumeric moniker, that single letter is a nod towards the handset's physical leanings.
ENGADGET
In fairness, everyone seems to be trying to copy the Germans in using alphanumeric model designations, and most of them are awful.
FORBES: Magazine Article

(of a character set, code, or file of data) consisting of alphabetical and numerical symbols