.只能匹配任意字符一次
.只能匹配任意字符一次

要匹配由数字和字母组成的字符，需要使用"^[a-zA-Z0-9]+$"，"^[a-zA-Z0-9]+."只能匹配由数字字母开头和一个任意字符组成的两个长度的字符串。
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