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Common regular expressions

2022-04-23 08:15:00 【Ling er~】

Only English letters are allowed 、 Numbers 、 Underline 、 English full stop 、 And the middle dash

^[a-zA-Z0-9_-]+@[a-zA-Z0-9_-]+(\.[a-zA-Z0-9_-]+)+$

The name allows Chinese characters 、 Letter 、 Numbers , Domain names are only allowed in English

^[A-Za-z0-9\u4e00-\u9fa5]+@[a-zA-Z0-9_-]+(\.[a-zA-Z0-9_-]+)+$

Name allows letters 、 Numbers 、 Order number 、 Center line , Domain names are only allowed in English and underlined , Order number , And only after the dot 2-4 position

/^([a-zA-Z0-9_.-])+@(([a-zA-Z0-9-])+\.)+([a-zA-Z0-9]{
    2,4})+$/

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