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Editor to share with you how to achieve Email verification of regular expressions, I believe that most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

The format of international domain name is as follows:

The domain name is made up of any combination of specific character sets, English letters, numbers and "-" (that is, hyphens or minus signs) of national characters, but the beginning and end cannot contain "-", "-" cannot appear continuously. Letters in the domain name are not case-sensitive. Domain names can be up to 60 bytes long (including the suffixes .com, .net, .org, etc.).

/ ^ [a-z0-9] * [- _]? [a-z0-9] +) * @ ([a-z0-9] * [- _]? [a-z0-9] +) + [\.] [a-z0-9] {2jue 3} ([\.] [Amurz] {2})? $/ I

/ content / I constitutes a case-insensitive regular expression

^ match starts

$end of match

[Amurz] E-Mail prefix must start with an English letter

([a-z0-9] * [-]? [a-z0-9] +) * matches _ axi2, aaa11, _ 1_a_2, but does not match A1 _, aaff_33a_, a__aa. If it is an empty character, it also matches. * indicates 0 or more.

* represents 0 or more preceding characters.

[a-z0-9] * matches 0 or more English letters or numbers

[- _]? Match 0 or 1 "-" because "-" cannot appear continuously

[a-z0-9] + matches one or more English letters or numbers because "-" cannot be used as an ending

@ there must be a @

([a-z0-9] * [- _]? [a-z0-9] +) + is explained above ([a-z0-9] * [- _]? [a-z0-9] +), but cannot be empty. + indicates one or more.

[\.] Set the special character (.) As ordinary characters.

[a murz] {2 Mague 3} matches 2 to 3 English letters, usually com or net, etc.

([\.] [amurz] {2})? Match 0 or 1 [\.] [a murz] {2} (for example, .cn, etc.) I don't know if the last part of the general .com.cn is two digits. If not, please modify {2} to {start and end words}.

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