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MailValidation

lcc

Struct MailValidation 

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pub struct MailValidation(/* private fields */);
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PART.4 驗證電子信箱：

  1. 必須包括 “@” 符號與“.“ 符號
  2. 將大小寫英文與數字都納入
  3. 只從字串編譯一次正則表達式 (once_cell crate)

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