Regular expressions validate mailboxes, phone numbers

Verify the phone number's regular: (\d{3}-) (\d{8}) $| (\d{4}-) (\d{7}) $| (\d{4}-) (\d{8}) $ (The phone number here is a modern number) Verify the regular mailbox:\w+ ([-+.] \w+) *@\w+ ([-.] \w+) *\.\w+ ([-.] \w+) * \w any case English letter 0-9 digit underline + to appear at least 1 characters [-+.] \w+ any containing-+. And the combination of \w characters appears 0 or more times @ Fixed Symbol \w+ at least 1 occurrences of \w characters [-.] \w+ appears 0 or more times this combination of characters \. Fixed symbol Anyway \w+ ([-.] \w+) * This combination is required to start with the \w type character, followed by the \w and-underline. The combination of the dot number The regular validation of the mailbox means that the whole sentence The email address must start with uppercase or lowercase letters or numbers or underscores. After that, you can follow any \w character and an underscore plus sign in English, followed by any \w character and the underlined plus sign in the English period . Keep up with any of the \w characters and the underlined plus sign English period

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