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  History of the most complex validation e-mail address regular expression
     
  Add Date : 2018-11-21      
         
         
         
  Use regular expressions to verify e-mail address appears to be a simple matter, but if you want a perfect verify compliance of e-mail addresses, in fact, may be very complex.

Specification mail address from RFC 5322. There is a website emailregex.com verify various programming languages specifically listed under the e-mail address regular expression, many of which are regular expressions I've heard about but never seen complicated - I would say, do this site the programmer is the message to verify it hurts deep ah!

In fact, in a production environment, generally we do not need such complex regular expressions to achieve 99.99% correct. In general, from the implementation of test coverage and efficiency, it requires only a simple version can be:

/^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$/i
So let's take a look at these more stringent, more complex regular expressions it:

 

Verify mail address common regular expressions (conforming to RFC 5322 standards)

? (: [! A-z0-9 # $% & '* + / = ^ _ `{|} ~ -?] + (:?.! \ [A-z0-9 # $% &' * + / = ^ _ `{|} ~ -] +) * |" (:?? [\ x01- \ x08 \ x0b \ x0c \ x0e- \ x1f \ x21 \ x23- \ x5b \ x5d- \ x7f] | \\ [\ x01- \ x09 \ x0b \ x0c \ x0e- \ x7f]) * ") @ (: (: [a-z0-9] (:??? [a-z0-9 -] * [a-z0 ?.? -9]) \) + [a-z0-9] (: [a-z0-9 -] * [a-z0-9]) | \ [(:( ?: 25 [0-?? 5] | 2 [0-4] [0-9] | [01] [0-9] [0-9]) \) {3} (?: 25 [0-5] |??. 2 [0 -4] [0-9] | [01] [0-9] [0-9] | [a-z0-9 -] * [a-z0-9]:??? (: [\ x01- \ x08 \ x0b \ x0c \ x0e- \ x1f \ x21- \ x5a \ x53- \ x7f] | \\ [\ x01- \ x09 \ x0b \ x0c \ x0e- \ x7f]) +) \])
Due to a variety of language support for regular expressions is different from the syntax coverage differences and different, so different languages inside the regular expression is also different:

 

Python

This is a simple version:

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

Javascript

This somewhat complicated:

/ ^ [- A-z0-9 ~ $% ^ & * _ = +} {\! '?] + (\ [-. A-z0-9 ~ $% ^ & * _ = +} {\!' ?] +) * @ ([a-z0-9 _] [- a-z0-9 _] * (\ [- a-z0-9 _] +.) * \ (aero |. arpa | biz | com | coop | edu | gov | info | int | mil | museum | name | net | org | pro | travel | mobi | [az] [az]) |. ([0-9] {1,3} \ [0-9] . {1,3} \ [0-9] {1,3} \ [0-9] {1,3})) (:.? [0-9] {1,5}) $ / i
 

Swift

[A-Z0-9a-z ._% + -] + @ [A-Za-z0-9 .-] + \\ [A-Za-z] {2,6}.
 

PHP

This version of PHP is more complex, the greater the coverage of some of them:

/ ^ ((: (: \ X22 \ x5C [\ x00- \ x7E] \ x22) | (:?!??????? \ X22 [^ \ x5C \ x22] \ x22)) {255,} ) ((: (: \ x22 \ x5C [\ x00- \ x7E] \ x22) | (:?!??????? \ x22 [^ \ x5C \ x22] \ x22)) {65,} @ ) | ((:: ([\ x21 \ x23- \ x27 \ x2A \ x2B \ x2D \ x2F- \ x39 \ x3D \ x3F \ x5E- \ x7E] +??):? \ x22 (: [\ x01? - \ x08 \ x0B \ x0C \ x0E- \ x1F \ x21 \ x23- \ x5B \ x5D- \ x7F] | (:? \ x5C [\ x00- \ x7F])) * \ x22)) (: \?. (: (: [\ x21 \ x23- \ x27 \ x2A \ x2B \ x2D \ x2F- \ x39 \ x3D \ x3F \ x5E- \ x7E] +) | (:??? \ x22 (: [\ x01-? \ x08 \ x0B \ x0C \ x0E- \ x1F \ x21 \ x23- \ x5B \ x5D- \ x7F] | (:? \ x5C [\ x00- \ x7F])) * \ x22))) * @ (?: (: (* {64,}) (:( :( ?: xn -) [a-z0-9] + (??!. [^.]:?? -?? [a-z0-9] . +) * \) {1,126}) {1,} (: (:??? [az] [a-z0-9] *) | (:( ?: xn -) [a-z0-9] +)) (: -????? [a-z0-9] +) *) | (: \ [(:( ?: IPv6: (: (: [a-f0-9] {1,4} {7}) | ((:: [a-f0-9] {1,4}?):??!?. ((: * [a-f0-9] [: \]]) {7,} ) (:? [a-f0-9] {1,4} (:: [a-f0-9] {1,4}?) {0,5}) :: (:?? [a-f0- 9] {1,4} {0,5})))) | (:( ?: IPv6 (:: [a-f0-9] {1,4}?):???? (: (: [ a-f0-9] {1,4} {5} :) | ((:: [a-f0-9] {1,4}?):??!?. ((: * [a-f0- 9]:) {5,}) (:? [a-f0-9] {1,4} (:: [a-f0-9] {1,4}) {0,3}) ::?? (:? [a-f0-9] {1,4} (:: [a-f0-9] {1,4}) {0,3}:?)))) (:( ?:??? 25 [0-5]) | (: 2 [0-4] [0-9]) | (:?? 1 [0-9] {2}) | (:?? [1-9] [0- 9])) (: \ (:( ?: 25 [0-5]) | (:?.? 2 [0-4] [0-9]) | (:?? 1 [0-9] {2 }) | (:?? [1-9] [0-9]))) {3})) \])) $ / iD
 

Perl / Ruby

Right and PHP versions, Perl, and Ruby pleaded, can be more precise:

(:?? (: \ R \ n) [\ t]?) * (: (: (: [^ () < > @,;:???. \\ "\ [\] \ 000- \ 031 ???] + (: (: (: \ r \ n) [\ t]) + | \ Z | (= [\ [ "() < > @,;: \\"?? \ [\]. ])) | "(: [^ \?"??? \ r \\] | \\ | (:.?? (: \ r \ n) [\ t])) * "(: (: \ r \ n) [\ t]) *) (: \ (: (: \ r \ n) [\ t]) * (: [^ () < > @,;:??.???? \\ " .??? \ [\] \ 000- \ 031] + (: (: (: \ r \ n) [\ t]) + | \ Z | (= [\ [ "() < > @,?? ;: ". \ [\]])) |" \\ (:?.?? [^ \ "\ r \\] | \\ | (: (: \ r \ n) [\ t]))? * "(:? (:? \ r \ n) [\ t]?) *)) * @ (:? (:? \ r \ n) [\ t]) * (:?? [^ () < > @,;:.????? \\ "\ [\] \ 000- \ 031] + (: (: (: \ r \ n) [\ t]) + | \ Z | (= [\ [ "() < > @,;: \\". \ [\]]?)) | \ [. ([^ \ [\] \ r \\] | \\) * \] (:( ?: \ r \ n) [\ t]) *) (: \ (: (: \ r \ n) [\ t]) * (: [^ () < > @,;:??.???? \ \ "\ [\] \ 000- \ 031] + (: (: (:.???? \ r \ n) [\ t]) + | \ Z | (= [\ [?" () < > @,;: \\ "\ [\]])) | \ [([^ \ [\] \ r \\] | \\) * \] (: (: \ r \ n)..??? [\ t]) *)) * | (:???? [^ () < > @,;:. \\ "\ [\] \ 000- \ 031] + (: (: (: \ r \ ?? n) [\ t]) + | \ Z | (= [\ [ "() < > @,;: \\". \ [\]])) | "? (: [^ \" \ r \\] | \\ |. (:?? (: \ r \ n) [\ t]?)) * "(: (: \ r \ n??) [\ t]) *) * \ < ? ? (:??? (: \ r \ n) [\ t]) * (: @ (: [^ () < > @,;:. \\ "\ [\] \ 000- \ 031]? + ??? (: (: (: \ r \ n) [\ t]) + | \ Z | (= [\ [ "() < > @,;: \\"?? \ [\]]). ) | \ [([^ \ [\] \ r \\] | \\) * \.] (: (: \ r \ n??) [\ t]) *) (: \ (??.? : (:? \ r \ n) [\ t]) *: [< > @, (^ (;: \\ "\ [\] \ 000- \ 031.??)] + (:( ?:? (:? \ r \ n) [\ t]) + | \ Z | "< > @, ((;: \\? = [\ [?)" \ [\]])) | \ [([. ^ \ [\] \ r \\] | \\) * \].?? (:?? (: \ r \ n) [\ t]) *)) * (:, @ (:( ?:? \ r \ n) [\ t]) * (: [^ () < > @,;: \\ "\ [\] \ 000- \ 031.]?? + (: (: (: \??? r \ n) [\ t]) + | \ Z | (= [\ [??. "() < > @,;: \\" \ [\]])) | \ [([^ \ [\ .] \ r \\] | \\) * \] (:?? (: \ r \ n) [\ t]) *)? (: \ (: (: \ r \ n?.??)? (? [\ t]) *: [^ () < > @,;:. \\ "\ [\] \ 000- \ 031]??? + (: (: (: \ r \ n) [? (? = \ t]) + | | \ Z [\ [ "() < > @,;: \\". \ [\]])) | \ [([^ \ [\] \ r \\] | \\) * \]. (:?? (: \ r \ n) [\ t]) *)) *) *: (: (: \ r \ n) [\ t]) *???? ? (?): [^ () < > @,;:. \\ "\ [\] \ 000- \ 031]???? + (: (: (: \ r \ n) [\ t]) + | \ Z | (? = [\ [ "() < > @,;: \\". \ [\]])) | "? (: [^ \" \ r \\] | \\ |. (:? (:? \ r \ n) [\ t]?)) * "(:? (:? \ r \ n) [\ t]) *) (:?? \ (:( ?:.? \ r \ n) [\ t]) * (: [^ () < > @,;: \\ "\ [\] \ 000- \ 031.]?? + (: (: (: \??? r \ n) [\ t]) + | \ Z | (= [\ [ "() < > @,;: \\"??. \ [\]])) | "? (: [^ \" \ r \\] | \\ |. (:?? (: \ r \ n) [\ t]?)) * "(: (: \ r \ n??) [\ t]) *))? * @ * (: [^ () < > @,.;: \\ "\ [\] \ 000- \ 031] (:: (\ r \ n) [\ t]???)? + (? : (:?? (: \ r \ n) [\ t]?) + | \ Z | (= [\ [ "() < > @,;: \\"? \ [\]].)) | \ [([^ \ [\] \ r \\] | \\.) * \] (:?? (: \ r \ n) [\ t]?) *) (: \ (:(?.? ?: \ r \ n) [\ t]) * (: [^ () < > @,;: \\ "\ [\] \ 000- \ 031.]?? + (:( :(??? : \ r \ n) [\ t]) + | \ Z | (= [\ [ "() < > @,;: \\"?? \ [\]])) | \ [([^ \. [\] \ r \\] | \\) * \]. (:?? (: \ r \ n) [\ t]) *)) * \> (: (: \ r \ n)??? ?? [\ t]) *) | (: [^ () < > @,;: \\ "\ [\] \ 000- \ 031.] + (: (: (: \ r \ n??? ?) [\ t]) + | \ Z | (= [\ [?. "() < > @,;: \\" \ [\]])) | "? (: [^ \" \ r \ \] | \\ |. (:?? (: \ r \ n) [\ t]?)) * "(: (: \ r \ n??) [\ t]) *) * :(?? : (:? \ r \ n) [\ t]) * (: (: (: [^ () < > @,;: \\ "\ [\] \ 000- \ 031.]???? + ??? (: (: (: \ r \ n) [\ t]) + | \ Z | (= [\ [ "() < > @,;: \\"?? \ [\]]). ) | "(: [^ \?"?? \ r \\] | \\ | (:.??? (: \ r \ n) [\ t])) * "(: (: \ r \ n ??.??) [\ t]) *) (: \ (: (: \ r \ n) [\ t]) * (: [^ () < > @,;:?? \\ "\. ??? [\] \ 000- \ 031] + (: (: (: \ r \ n) [\ t]) + | \ Z | (= [\ [ "() < > @,;??: \\ "\ [\]])) |." (: [^ \? "\ r \\] | \\ | (:.?? (: \ r \ n) [\ t])) *?" (:? (:?? \ r \ n) [\ t]) *)) * @ (:? (:? \ r \ n) [\ t]) * (:?? [^ () < > @ ,;: \\ ".????? \ [\] \ 000- \ 031] + (: (: (: \ r \ n) [\ t]) + | \ Z | (= [\ [" () < > @,;:..?? \\ "\ [\]])) | \ [([^ \ [\] \ r \\] | \\) * \] (: (: \ r \ n) [\ t]) *) (: \ (: (: \ r \ n) [\ t]) * (: [^ () < > @,;:??.???? \\ " .??? \ [\] \ 000- \ 031] + (: (: (: \ r \ n) [\ t]) + | \ Z | (= [\ [ "() < > @,?? ;:..?? \\ "\ [\]])) | \ [([^ \ [\] \ r \\] | \\) * \] (: (: \ r \ n) [\? t]) *)) * | (: [^ () < > @,;: \\ "\ [\.]? \ 000- \ 031] + (: (: (: \ r \ n???) ? [\ t]) + | \ Z | (= [\ [?. "< > @, ();: \\" \ [\]])) | "? (: [^ \" \ r \\ ] | \\ |. (:?? (: \ r \ n) [\ t]?)) * "(: (: \ r \ n??) [\ t]) *) * \ < (?? : (:? \ r \ n) [\ t]) * (: @ (: [^ () < > @,;: \\ "\ [\] \ 000- \ 031.]??? + (? : (:?? (: \ r \ n) [\ t]?) + | \ Z | (= [\ [ "() < > @,;: \\"? \ [\]].)) | \ [([^ \ [\] \ r \\] | \\.) * \] (:?? (: \ r \ n) [\ t]?) *) (: \ (:(?.? ?: \ r \ n) [\ t]) * (: [^ () < > @,;: \\ "\ [\] \ 000- \ 031.]?? + (:( :(??? : \ r \ n) [\ t]) + | \ Z | (= [\ [ "() < > @,;: \\"?? \ [\]])) | \ [([^ \. [\] \ r \\] | \\) * \].?? (:?? (: \ r \ n) [\ t]) *)) * (:, @ (: (: \ r?? \ n) [\ t]) * (: [^ () < > @,;: \\ "\ [\] \ 000- \ 031.]?? + (: (: (: \ r \??? ?? n) [\ t]) + | \ Z | (= [\ [ "() < > @,;: \\". \ [\]])) | \ [([^ \ [\] \ r \\] | \\) * \]. (:?? (: \ r \ n) [\ t]) *) [\? (: \ (:: (\ r \ n?.??)? (? t]) *: [^ () < > @,;:. \\ "\ [\]???? \ 000- \ 031] + (: (: (: \ r \ n) [\ t (? =]) + | | \ Z [\ [ "() < > @,;: \\". \ [\]])) | \ [([^ \ [\] \ r \\] | \ \) * \]. (:? (:? \ r \ n) [\ t]) *)) *) *:? (:? (:? \ r \ n) [\ t]) *)?? ???? (: [. ^ () < > @,;: \\ "\ [\] \ 000- \ 031] + (: (: (: \ r \ n) [\ t]) + |? \ Z | (? = [\ [ "() < > @,;: \\". \ [\]])) | "? (: [^ \" \ r \\] | \\ | (.? : (:? \ r \ n) [\ t])) * "(:?? (:? \ r \ n) [\ t]) *) (:?? \ (:.? (:? \ r \ n) [\ t]) * (: [^ () < > @,;: \\ "\ [\] \ 000- \ 031.]?? + (: (: (: \ r \??? ?? n) [\ t]) + | \ Z | (= [\ [ "() < > @,;: \\". \ [\]])) | "? (: [^ \" \ r \\] | \\ |. (:?? (: \ r \ n) [\ t]?)) * "(: (: \ r \ n??) [\ t]) *)) * @? (:?? (: \ r \ n) [\ t]?) * (: [^ () < > @,;: \\ "\ [\] \ 000- \ 031.]? + (:(? ?: (:? \ r \ n) [\ t]) + | \ Z | "< > @, ((;: \\? = [\ [?)" \ [\]])) | \ [. ([^ \ [\] \ r \\] | \\.) * \] (:?? (: \ r \ n) [\ t]?) *) (: \ (:( ?:?.? \ r \ n) [\ t]) * (: [^ () < > @,;: \\ "\ [\] \ 000- \ 031.]?? + (: (: (: \??? r \ n) [\ t]) + | \ Z | (= [\ [??. "() < > @,;: \\" \ [\]])) | \ [([^ \ [\ ] \ r \\] | \\) * \]. (:?? (: \ r \ n) [\ t]) *)) * \> (: (: \ r \ n) [???? ? \ t]) *) (:, \ s * (: (:?? [^ () < > @,;: \\ "\ [\.] \ 000- \ 031] + (:( ?:? (:? \ r \ n) [\ t]) + | \ Z | "< > @, ((;: \\? = [\ [?)" \ [\]])) | "(?:. [^ \ "\ r \\] | \\ |.) * (:: (\ r \ n) [\ t]???)" (: (: \ r \ n??) [\ t]? ) *) (:?.?? \ (: (: \ r \ n) [\ t]) *: < > @,? ([^ (?);:. \\ "\ [\] \ 000- ??? \ 031] + (: (: (: \ r \ n) [\ t]) + | \ Z | (= [\ [ "() < > @,;: \\"?? \ [. \]])) | "(: [^ \?" \ r \\] | \\ | (:.?? (: \ r \ n) [\ t])) * "(:( ?:?? \ r \ n) [\ t]) *)) * @ (: (: \ r \ n) [\ t]) * (: [^ () < > @,;:????? \\ " .??? \ [\] \ 000- \ 031] + (: (: (: \ r \ n) [\ t]) + | \ Z | (= [\ [ "() < > @,?? ;:..?? \\ "\ [\]])) | \ [([^ \ [\] \ r \\] | \\) * \] (: (: \ r \ n) [\? t]) *) (: \ (: (: \ r \ n?.??) [\ t]) *: < > @, ([^ (?);: \\ "\ [\.]? \ ??? 000- \ 031] + (: (: (: \ r \ n) [\ t]) + | \ Z | (= [\ [ "() < > @,;: \\"??. \ [\]])) | \ [([^ \ [\] \ r \\] | \\) * \] (:.?? (: \ r \ n) [\ t]) *))? ? * | (: [^ () < > @,;: \\ "\ [\] \ 000- \ 031.] + (: (: (: \ r \ n) [\ t])???? + | \ Z | (? = [\ [ "() < > @,;: \\". \ [\]])) | "? (: [^ \" \ r \\] | \\ |. (:? (:? \ r \ n) [\ t]?)) * "(:? (:? \ r \ n) [\ t]) *) * \ < (:?? (:? \ r \ n) [\ t]) * (: @ (:?? [^ () < > @,;: \\ "\ [\] \ 000- \ 031.]? + (:( :(??? : \ r \ n) [\ t]) + | \ Z | (= [\ [ "() < > @,;: \\"?? \ [\]])) | \ [([^ \. [\] \ r \\] | \\) * \].??.?? (:?? (: \ r \ n) [\ t]) *) (: \ (: (: \ r \ n ??) [\ t]) * (: [^ () < > @,;:. \\ "\ [\] \ 000- \ 031]??? + (: (: (: \ r \ n) ? (? = [\ [[\ t]) + | | \ Z "() < > @,;: \\". \ [\]])) | \ [([^ \ [\] \ r \ \] | \\) * \]. (:?? (: \ r \ n) [\ t]) *)) * (:, @ (: (: \ r \ n) [\????? (? t]) *: [^ () < > @,;:. \\ "\ [\]???? \ 000- \ 031] + (: (: (: \ r \ n) [\ t (? =]) + | | \ Z [\ [ "() < > @,;: \\". \ [\]])) | \ [([^ \ [\] \ r \\] | \ \) * \]. (:? (:? \ r \ n) [\ t]) *)? (:? \ (:.? (:? \ r \ n) [\ t]) * (?? : [^ () < > @,;:. \\ "\ [\] \ 000- \ 031]???? + (: (: (: \ r \ n) [\ t]) + | \ Z | (? = [\ [ "() < > @,;: \\". \ [\]]).) | \ [([^ \ [\] \ r \\] | \\) * \] (:? (:? \ r \ n) [\ t]?) *)) *) *: (:? (:? \ r \ n) [\ t]) *) (:??? [^ ( ) < > @,;:. \\ "\ [\] \ 000- \ 031] + (:???? (: (: \ r \ n) [\ t]) + | \ Z | (=? [\ [ "() < > @,;: \\"..?? \ [\]])) | "? (: [^ \" \ r \\] | \\ | (: (: \ r \ n) [\ t])) * "(:?? (:? \ r \ n) [\ t]) *) (:?? \ (:.? (:? \ r \ n) [\? (? t]) *: [^ () < > @,;:. \\ "\ [\]???? \ 000- \ 031] + (: (: (: \ r \ n) [\ t (? =]) + | | \ Z [\ [ "() < > @,;: \\". \ [\]])) | "? (: [^ \" \ r \\] | \\ . |? (:??? (: \ r \ n) [\ t])) * "(:?? (: \ r \ n) [\ t]) *)) * @ (:( ?:? \ r \ n) [\ t]) * (: [^ () < > @,;: \\ "\ [\] \ 000- \ 031.]?? + (: (: (: \??? r \ n) [\ t]) + | \ Z | (= [\ [??. "() < > @,;: \\" \ [\]])) | \ [([^ \ [\ .] \ r \\] | \\) * \] (:?? (: \ r \ n) [\ t]) *)? (: \ (: (: \ r \ n?.??)? (? [\ t]) *: [^ () < > @,;:. \\ "\ [\] \ 000- \ 031]??? + (: (: (: \ r \ n) [? (? = \ t]) + | | \ Z [\ [ "() < > @,;: \\". \ [\]])) | \ [([^ \ [\] \ r \\] | \\) * \]. (:?? (: \ r \ n) [\ t]) *)) * \> (: (: \ r \ n) [\ t]) *)???? ) *);? \ s
 

Perl 5.10 and later

The above version, ah, I can say that it is the bible? Anyway, I do not interpret ideas. Of course, the new version of the Perl language as well as a more readable version (you really mean it?)

/ (? (DEFINE)
(< Address> (& mailbox) |??? (& Group))
(? < Mailbox> (& name_addr) |?? (& Addr_spec))
(? < Name_addr> (? & Display_name)? (? & Angle_addr))
(? < Angle_addr> (? & CFWS)? < (? & Addr_spec)> (? & CFWS)?)
? (< Group> (& display_name): (: (& mailbox_list) | (& CFWS)) ?;????
(? & CFWS)?)
(? < Display_name> (? & Phrase))
(? < Mailbox_list> (& mailbox) (:???, (& Mailbox)) *)
(? < Addr_spec> (? & Local_part) \ @ (? & Domain))
(? < Local_part> (& dot_atom) |?? (& Quoted_string))
(? < Domain> (& dot_atom) |? (& Domain_literal)?)
? (< Domain_literal> (& CFWS) \ [(:???? (& FWS) (& dcontent)) * (& FWS)????
\] (? & CFWS)?)
(? < Dcontent> (& dtext) |? (& Quoted_pair)?)
(? < Dtext> (& NO_WS_CTL) |? [\ X21- \ x5a \ x5e- \ x7e])
(? < Atext> (& ALPHA) | (& DIGIT) |?? [# \ $% & '* + - / = ^ _ `!? {|} ~])
(? < Atom> (? & CFWS)? (? & Atext) + (? & CFWS)?)
(? < Dot_atom> (? & CFWS)? (? & Dot_atom_text) (? & CFWS)?)
(? < Dot_atom_text> (& atext) + (:??.? \ (& Atext) +) *)
(? < Text> [\ x01- \ x09 \ x0b \ x0c \ x0e- \ x7f])
(? < Quoted_pair> \\ (? & Text))
(? < Qtext> (& NO_WS_CTL) |? [\ X21 \ x23- \ x5b \ x5d- \ x7e])
(? < Qcontent> (& qtext) |?? (& Quoted_pair))
? (< Quoted_string> (& CFWS) (& DQUOTE) (:??????? (& FWS) (& qcontent)) *
(? & FWS)? (? & DQUOTE) (? & CFWS)?)
(? < Word> (& atom) |? (& Quoted_string)?)
(? < Phrase> (? & Word) +)
# Folding white space
(< FWS> (:?????? (& WSP) * (& CRLF)) (& WSP) +)
(< Ctext> (& NO_WS_CTL) |?? [\ X21- \ x27 \ x2a- \ x5b \ x5d- \ x7e])
(? < Ccontent> (& ctext) |?? (& Quoted_pair) |? (& Comment))
(? < Comment> \ ((:?? (& FWS) (& ccontent)) * (& FWS) \)????)
(< CFWS> (:????? (& FWS) (& comment)) *
(:??? (: (& FWS) (& comment)) | (& FWS)???))
# No whitespace control
(? < NO_WS_CTL> [\ x01- \ x08 \ x0b \ x0c \ x0e- \ x1f \ x7f])
(? < ALPHA> [A-Za-z])
(? < DIGIT> [0-9])
(? < CRLF> \ x0d \ x0a)
(? < DQUOTE> ")
(? < WSP> [\ x20 \ x09])
)
(? & Address) / x
 

Ruby (Simple version)

Ruby said, in fact the people there is a simpler version:

/\A([\w+\-].?)+@[a-z\d\-]+(\.[a-z]+)*\.[a-z]+\z/i
 

.NET

This version does not ah --.NET who said:

^ \ W + ([-. + '] \ W +) * @ \ w + ([-.] \ W +). * \ \ W + ([-.] \ W +) * $
 

grep command

Find e-mail address in the file with the grep command, I think you can not write a few lines of regex it, meaning you will do:

$ Grep -E -o "\ b [A-Za-z0-9 ._% + -]. + @ [A-Za-z0-9 .-] + \ [A-Za-z] {2,6 } \ b "filename.txt
SQL Server

In SQL Server, you can also use regular expressions, but this should be a code fragment from a production environment, it is also considerate to take care of those who put the wrong e-mail address:

select email
from table_name where
patindex ( '% [&' ', ":;! + = \ / () < >]%', email)> 0 - Invalid characters
or patindex ( '[@-_.]%', email)> 0 - Valid but can not be starting character
or patindex ( '% [@-_.]', email)> 0 - Valid but can not be ending character
or email not like'%@%.%'--Must contain at least one @and one.
or email like '% ..%' - Can not have two periods in a row
or email like '% @% @%' - Can not have two @ anywhere
or email like '.% @%' or email like '% @%.' - Can not have @ and.next to each other
or email like '% .cm'or email like'% .co '- CamaroonorColombia Typos?.
or email like '% .or'or email like'% .ne '- Missinglast letter
 

Oracle PL / SQL

This is not a bit lazy? Especially in those "complex" after a regular expression:

SELECT email
FROM table_name
WHERE REGEXP_LIKE (email, '. [A-Z0-9 ._% -] + @ [A-Z0-9 ._% -] + \ [A-Z] {2,4}');
 

MySQL

Okay, finally, too lazy:

SELECT * FROM `users` WHERE` email` NOT REGEXP '. ^ [A-Z0-9 ._% -] + @ [A-Z0-9 .-] + \ [A-Z] {2,4} $';
     
         
         
         
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