Regular expression to verify email and phone number

Regular for verifying phone numbers: (d{3}-)(d{8})$|(d{4}-)(d{7})$|(d{4}-)(d{8) })$

　　　　　(The phone number here is a new type of number)

Verification of email address: w+([-+.]w+)*@w+([-.]w+)*.w+([-.]w+)*

　　　　wAny uppercase and lowercase English letters, 0-9 numbers, underscores + means at least one character appears
　　　　[-+.]w+ Any combination of - + . and w characters appears 0 or more times

　　　@ Fixed symbol

　　　　w+ The character w appears at least 1 time or more
　　　　[-.]w+ The character that appears zero or more times in this combination

　　　　. Fixed symbol

　　　　　Anyway, w+([-.]w+)* This combination is stipulated to start with a w type character, and then followed by w and a combination of - dash and period

Regular verification of email The whole sentence means

　　　　　Email address must start with uppercase and lowercase letters or numbers or underscores,

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