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需要写一个正则表达式。条件是不能有标点符号。不能中英文混杂

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需要写一个正则表达式。条件是不能有标点符号。不能中英文混杂

需要写一个正则表达式。条件是只允许出现单独出现中文或者英文或者数字或者中文+数字，或者英文+数字。不能中英文混杂，也不能要标点符号空格等


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