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仅可输入中英文，不可混合输入，中文最多5个字，英文最多20个字

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仅可输入中英文，不可混合输入，中文最多5个字，英文最多20个字

仅可输入中英文，不可混合输入，中文最多5个字，英文最多20个字的正则表达式


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  1. 可以理解成，连续1~5个中文，或连续1~20个英文
  2. 所以很简单 /^([u4e00-u9fa5]{1,5}|[a-zA-Z]{1,20})$/

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