alphameric
/ælfəˈmerɪk/(of a character set, code, or file of data) consisting of alphabetical and numerical symbols 包括字母与数字的
adjective [原级] [计] 字母数字的；字母数字混合编制的
The password must contain at least one alphameric character. 密码必须包含至少一个字母数字字符。
