我没有发现任何涉及顶级域名的，但应该考虑。

所以对我来说，以下方法奏效了：

[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+(?:[A-Z]{2}AAA|AARP|ABB|ABBOTT|ABOGADO|AC|ACADEMY|ACCENTURE|ACCOUNTANT|ACCOUNTANTS|ACO|ACTIVE|ACTOR|AD|ADAC|ADS|ADULT|AE|AEG|AERO|AF|AFL|AG|AGENCY|AI|AIG|AIRFORCE|AIRTEL|AL|ALIBABA|ALIPAY|ALLFINANZ|ALSACE|AM|AMICA|AMSTERDAM|ANALYTICS|ANDROID|AO|APARTMENTS|APP|APPLE|AQ|AQUARELLE|AR|ARAMCO|ARCHI|ARMY|ARPA|ARTE|AS|ASIA|ASSOCIATES|AT|ATTORNEY|AU|AUCTION|AUDI|AUDIO|AUTHOR|AUTO|AUTOS|AW|AX|AXA|AZ|AZURE|BA|BAIDU|BAND|BANK|BAR|BARCELONA|BARCLAYCARD|BARCLAYS|BARGAINS|BAUHAUS|BAYERN|BB|BBC|BBVA|BCN|BD|BE|BEATS|BEER|BENTLEY|BERLIN|BEST|BET|BF|BG|BH|BHARTI|BI|BIBLE|BID|BIKE|BING|BINGO|BIO|BIZ|BJ|BLACK|BLACKFRIDAY|BLOOMBERG|BLUE|BM|BMS|BMW|BN|BNL|BNPPARIBAS|BO|BOATS|BOEHRINGER|BOM|BOND|BOO|BOOK|BOOTS|BOSCH|BOSTIK|BOT|BOUTIQUE|BR|BRADESCO|BRIDGESTONE|BROADWAY|BROKER|BROTHER|BRUSSELS|BS|BT|BUDAPEST|BUGATTI|BUILD|BUILDERS|BUSINESS|BUY|BUZZ|BV|BW|BY|BZ|BZH|CA|CAB|CAFE|CAL|CALL|CAMERA|CAMP|CANCERRESEARCH|CANON|CAPETOWN|CAPITAL|CAR|CARAVAN|CARDS|CARE|CAREER|CAREERS|CARS|CARTIER|CASA|CASH|CASINO|CAT|CATERING|CBA|CBN|CC|CD|CEB|CENTER|CEO|CERN|CF|CFA|CFD|CG|CH|CHANEL|CHANNEL|CHAT|CHEAP|CHLOE|CHRISTMAS|CHROME|CHURCH|CI|CIPRIANI|CIRCLE|CISCO|CITIC|CITY|CITYEATS|CK|CL|CLAIMS|CLEANING|CLICK|CLINIC|CLINIQUE|CLOTHING|CLOUD|CLUB|CLUBMED|CM|CN|CO|COACH|CODES|COFFEE|COLLEGE|COLOGNE|COM|COMMBANK|COMMUNITY|COMPANY|COMPARE|COMPUTER|COMSEC|CONDOS|CONSTRUCTION|CONSULTING|CONTACT|CONTRACTORS|COOKING|COOL|COOP|CORSICA|COUNTRY|COUPONS|COURSES|CR|CREDIT|CREDITCARD|CREDITUNION|CRICKET|CROWN|CRS|CRUISES|CSC|CU|CUISINELLA|CV|CW|CX|CY|CYMRU|CYOU|CZ|DABUR|DAD|DANCE|DATE|DATING|DATSUN|DAY|DCLK|DE|DEALER|DEALS|DEGREE|DELIVERY|DELL|DELTA|DEMOCRAT|DENTAL|DENTIST|DESI|DESIGN|DEV|DIAMONDS|DIET|DIGITAL|DIRECT|DIRECTORY|DISCOUNT|DJ|DK|DM|DNP|DO|DOCS|DOG|DOHA|DOMAINS|DOOSAN|DOWNLOAD|DRIVE|DUBAI|DURBAN|DVAG|DZ|EARTH|EAT|EC|EDEKA|EDU|EDUCATION|EE|EG|EMAIL|EMERCK|ENERGY|ENGINEER|ENGINEERING|ENTERPRISES|EPSON|EQUIPMENT|ER|ERNI|ES|ESQ|ESTATE|ET|EU|EUROVISION|EUS|EVENTS|EVERBANK|EXCHANGE|EXPERT|EXPOSED|EXPRESS|FAGE|FAIL|FAIRWINDS|FAITH|FAMILY|FAN|FANS|FARM|FASHION|FAST|FEEDBACK|FERRERO|FI|FILM|FINAL|FINANCE|FINANCIAL|FIRESTONE|FIRMDALE|FISH|FISHING|FIT|FITNESS|FJ|FK|FLIGHTS|FLORIST|FLOWERS|FLSMIDTH|FLY|FM|FO|FOO|FOOTBALL|FORD|FOREX|FORSALE|FORUM|FOUNDATION|FOX|FR|FRESENIUS|FRL|FROGANS|FUND|FURNITURE|FUTBOL|FYI|GA|GAL|GALLERY|GAME|GARDEN|GB|GBIZ|GD|GDN|GE|GEA|GENT|GENTING|GF|GG|GGEE|GH|GI|GIFT|GIFTS|GIVES|GIVING|GL|GLASS|GLE|GLOBAL|GLOBO|GM|GMAIL|GMO|GMX|GN|GOLD|GOLDPOINT|GOLF|GOO|GOOG|GOOGLE|GOP|GOT|GOV|GP|GQ|GR|GRAINGER|GRAPHICS|GRATIS|GREEN|GRIPE|GROUP|GS|GT|GU|GUCCI|GUGE|GUIDE|GUITARS|GURU|GW|GY|HAMBURG|HANGOUT|HAUS|HEALTH|HEALTHCARE|HELP|HELSINKI|HERE|HERMES|HIPHOP|HITACHI|HIV|HK|HM|HN|HOCKEY|HOLDINGS|HOLIDAY|HOMEDEPOT|HOMES|HONDA|HORSE|HOST|HOSTING|HOTELES|HOTMAIL|HOUSE|HOW|HR|HSBC|HT|HU|HYUNDAI|IBM|ICBC|ICE|ICU|ID|IE|IFM|IINET|IL|IM|IMMO|IMMOBILIEN|IN|INDUSTRIES|INFINITI|INFO|ING|INK|INSTITUTE|INSURANCE|INSURE|INT|INTERNATIONAL|INVESTMENTS|IO|IPIRANGA|IQ|IR|IRISH|IS|ISELECT|IST|ISTANBUL|IT|ITAU|IWC|JAGUAR|JAVA|JCB|JE|JETZT|JEWELRY|JLC|JLL|JM|JMP|JO|JOBS|JOBURG|JOT|JOY|JP|JPRS|JUEGOS|KAUFEN|KDDI|KE|KFH|KG|KH|KI|KIA|KIM|KINDER|KITCHEN|KIWI|KM|KN|KOELN|KOMATSU|KP|KPN|KR|KRD|KRED|KW|KY|KYOTO|KZ|LA|LACAIXA|LAMBORGHINI|LAMER|LANCASTER|LAND|LANDROVER|LANXESS|LASALLE|LAT|LATROBE|LAW|LAWYER|LB|LC|LDS|LEASE|LECLERC|LEGAL|LEXUS|LGBT|LI|LIAISON|LIDL|LIFE|LIFEINSURANCE|LIFESTYLE|LIGHTING|LIKE|LIMITED|LIMO|LINCOLN|LINDE|LINK|LIVE|LIVING|LIXIL|LK|LOAN|LOANS|LOL|LONDON|LOTTE|LOTTO|LOVE|LR|LS|LT|LTD|LTDA|LU|LUPIN|LUXE|LUXURY|LV|LY|MA|MADRID|MAIF|MAISON|MAKEUP|MAN|MANAGEMENT|MANGO|MARKET|MARKETING|MARKETS|MARRIOTT|MBA|MC|MD|ME|MED|MEDIA|MEET|MELBOURNE|MEME|MEMORIAL|MEN|MENU|MEO|MG|MH|MIAMI|MICROSOFT|MIL|MINI|MK|ML|MM|MMA|MN|MO|MOBI|MOBILY|MODA|MOE|MOI|MOM|MONASH|MONEY|MONTBLANC|MORMON|MORTGAGE|MOSCOW|MOTORCYCLES|MOV|MOVIE|MOVISTAR|MP|MQ|MR|MS|MT|MTN|MTPC|MTR|MU|MUSEUM|MUTUELLE|MV|MW|MX|MY|MZ|NA|NADEX|NAGOYA|NAME|NAVY|NC|NE|NEC|NET|NETBANK|NETWORK|NEUSTAR|NEW|NEWS|NEXUS|NF|NG|NGO|NHK|NI|NICO|NINJA|NISSAN|NL|NO|NOKIA|NORTON|NOWRUZ|NP|NR|NRA|NRW|NTT|NU|NYC|NZ|OBI|OFFICE|OKINAWA|OM|OMEGA|ONE|ONG|ONL|ONLINE|OOO|ORACLE|ORANGE|ORG|ORGANIC|ORIGINS|OSAKA|OTSUKA|OVH|PA|PAGE|PAMPEREDCHEF|PANERAI|PARIS|PARS|PARTNERS|PARTS|PARTY|PE|PET|PF|PG|PH|PHARMACY|PHILIPS|PHOTO|PHOTOGRAPHY|PHOTOS|PHYSIO|PIAGET|PICS|PICTET|PICTURES|PID|PIN|PING|PINK|PIZZA|PK|PL|PLACE|PLAY|PLAYSTATION|PLUMBING|PLUS|PM|PN|POHL|POKER|PORN|POST|PR|PRAXI|PRESS|PRO|PROD|PRODUCTIONS|PROF|PROMO|PROPERTIES|PROPERTY|PROTECTION|PS|PT|PUB|PW|PY|QA|QPON|QUEBEC|RACING|RE|READ|REALTOR|REALTY|RECIPES|RED|REDSTONE|REDUMBRELLA|REHAB|REISE|REISEN|REIT|REN|RENT|RENTALS|REPAIR|REPORT|REPUBLICAN|REST|RESTAURANT|REVIEW|REVIEWS|REXROTH|RICH|RICOH|RIO|RIP|RO|ROCHER|ROCKS|RODEO|ROOM|RS|RSVP|RU|RUHR|RUN|RW|RWE|RYUKYU|SA|SAARLAND|SAFE|SAFETY|SAKURA|SALE|SALON|SAMSUNG|SANDVIK|SANDVIKCOROMANT|SANOFI|SAP|SAPO|SARL|SAS|SAXO|SB|SBS|SC|SCA|SCB|SCHAEFFLER|SCHMIDT|SCHOLARSHIPS|SCHOOL|SCHULE|SCHWARZ|SCIENCE|SCOR|SCOT|SD|SE|SEAT|SECURITY|SEEK|SELECT|SENER|SERVICES|SEVEN|SEW|SEX|SEXY|SFR|SG|SH|SHARP|SHELL|SHIA|SHIKSHA|SHOES|SHOW|SHRIRAM|SI|SINGLES|SITE|SJ|SK|SKI|SKIN|SKY|SKYPE|SL|SM|SMILE|SN|SNCF|SO|SOCCER|SOCIAL|SOFTBANK|SOFTWARE|SOHU|SOLAR|SOLUTIONS|SONY|SOY|SPACE|SPIEGEL|SPREADBETTING|SR|SRL|ST|STADA|STAR|STARHUB|STATEFARM|STATOIL|STC|STCGROUP|STOCKHOLM|STORAGE|STUDIO|STUDY|STYLE|SU|SUCKS|SUPPLIES|SUPPLY|SUPPORT|SURF|SURGERY|SUZUKI|SV|SWATCH|SWISS|SX|SY|SYDNEY|SYMANTEC|SYSTEMS|SZ|TAB|TAIPEI|TAOBAO|TATAMOTORS|TATAR|TATTOO|TAX|TAXI|TC|TCI|TD|TEAM|TECH|TECHNOLOGY|TEL|TELEFONICA|TEMASEK|TENNIS|TF|TG|TH|THD|THEATER|THEATRE|TICKETS|TIENDA|TIFFANY|TIPS|TIRES|TIROL|TJ|TK|TL|TM|TMALL|TN|TO|TODAY|TOKYO|TOOLS|TOP|TORAY|TOSHIBA|TOURS|TOWN|TOYOTA|TOYS|TR|TRADE|TRADING|TRAINING|TRAVEL|TRAVELERS|TRAVELERSINSURANCE|TRUST|TRV|TT|TUBE|TUI|TUSHU|TV|TW|TZ|UA|UBS|UG|UK|UNIVERSITY|UNO|UOL|US|UY|UZ|VA|VACATIONS|VANA|VC|VE|VEGAS|VENTURES|VERISIGN|VERSICHERUNG|VET|VG|VI|VIAJES|VIDEO|VILLAS|VIN|VIP|VIRGIN|VISION|VISTA|VISTAPRINT|VIVA|VLAANDEREN|VN|VODKA|VOLKSWAGEN|VOTE|VOTING|VOTO|VOYAGE|VU|WALES|WALTER|WANG|WANGGOU|WATCH|WATCHES|WEATHER|WEBCAM|WEBER|WEBSITE|WED|WEDDING|WEIR|WF|WHOSWHO|WIEN|WIKI|WILLIAMHILL|WIN|WINDOWS|WINE|WME|WORK|WORKS|WORLD|WS|WTC|WTF|XBOX|XEROX|XIN|XN--11B4C3D|XN--1QQW23A|XN--30RR7Y|XN--3BST00M|XN--3DS443G|XN--3E0B707E|XN--3PXU8K|XN--42C2D9A|XN--45BRJ9C|XN--45Q11C|XN--4GBRIM|XN--55QW42G|XN--55QX5D|XN--6FRZ82G|XN--6QQ986B3XL|XN--80ADXHKS|XN--80AO21A|XN--80ASEHDB|XN--80ASWG|XN--90A3AC|XN--90AIS|XN--9DBQ2A|XN--9ET52U|XN--B4W605FERD|XN--C1AVG|XN--C2BR7G|XN--CG4BKI|XN--CLCHC0EA0B2G2A9GCD|XN--CZR694B|XN--CZRS0T|XN--CZRU2D|XN--D1ACJ3B|XN--D1ALF|XN--ECKVDTC9D|XN--EFVY88H|XN--ESTV75G|XN--FHBEI|XN--FIQ228C5HS|XN--FIQ64B|XN--FIQS8S|XN--FIQZ9S|XN--FJQ720A|XN--FLW351E|XN--FPCRJ9C3D|XN--FZC2C9E2C|XN--G2XX48C|XN--GECRJ9C|XN--H2BRJ9C|XN--HXT814E|XN--I1B6B1A6A2E|XN--IMR513N|XN--IO0A7I|XN--J1AEF|XN--J1AMH|XN--J6W193G|XN--JLQ61U9W7B|XN--KCRX77D1X4A|XN--KPRW13D|XN--KPRY57D|XN--KPU716F|XN--KPUT3I|XN--L1ACC|XN--LGBBAT1AD8J|XN--MGB9AWBF|XN--MGBA3A3EJT|XN--MGBA3A4F16A|XN--MGBAAM7A8H|XN--MGBAB2BD|XN--MGBAYH7GPA|XN--MGBB9FBPOB|XN--MGBBH1A71E|XN--MGBC0A9AZCG|XN--MGBERP4A5D4AR|XN--MGBPL2FH|XN--MGBT3DHD|XN--MGBTX2B|XN--MGBX4CD0AB|XN--MK1BU44C|XN--MXTQ1M|XN--NGBC5AZD|XN--NGBE9E0A|XN--NODE|XN--NQV7F|XN--NQV7FS00EMA|XN--NYQY26A|XN--O3CW4H|XN--OGBPF8FL|XN--P1ACF|XN--P1AI|XN--PBT977C|XN--PGBS0DH|XN--PSSY2U|XN--Q9JYB4C|XN--QCKA1PMC|XN--QXAM|XN--RHQV96G|XN--S9BRJ9C|XN--SES554G|XN--T60B56A|XN--TCKWE|XN--UNUP4Y|XN--VERMGENSBERATER-CTB|XN--VERMGENSBERATUNG-PWB|XN--VHQUV|XN--VUQ861B|XN--WGBH1C|XN--WGBL6A|XN--XHQ521B|XN--XKC2AL3HYE2A|XN--XKC2DL3A5EE0H|XN--Y9A3AQ|XN--YFRO4I67O|XN--YGBI2AMMX|XN--ZFR164B|XPERIA|XXX|XYZ|YACHTS|YAMAXUN|YANDEX|YE|YODOBASHI|YOGA|YOKOHAMA|YOUTUBE|YT|ZA|ZARA|ZERO|ZIP|ZM|ZONE|ZUERICH|ZW)\b

容易丢弃的电子邮件3c296rD3HNEE@d139c.a51, Sd@sd.dox等

如果需要，可以进一步编辑域名，例如特定国家域等。

另一个经常更新的顶级域列表。

为了使用JavaScript验证电子邮件地址，使用此功能更方便和高效（根据W3Schools）：

function validateEmail()
{
    var x = document.f.email.value;
    var atpos = x.indexOf("@");
    var dotpos = x.lastIndexOf(".");
    if (atpos < 1 || dotpos < atpos+2 || dotpos+2 >= x.length)
    {
        alert("Not a valid e-mail address");
        return false;
    }
}

我用它，它很完美。

作为一个生动的演示，下面的怪物很好，但它仍然不能正确识别所有语法上有效的电子邮件地址：它可以识别多达四层的嵌套评论。

这是解析器的工作，但即使地址在语法上有效，也可能无法交付。有时你不得不求助于乡巴佬的方法，“嘿，你们，看着我们！”

// derivative of work with the following copyright and license:
// Copyright (c) 2004 Casey West.  All rights reserved.
// This module is free software; you can redistribute it and/or
// modify it under the same terms as Perl itself.

// see http://search.cpan.org/~cwest/Email-Address-1.80/

private static string gibberish = @"
(?-xism:(?:(?-xism:(?-xism:(?-xism:(?-xism:(?-xism:(?-xism:\
s*\((?:\s*(?-xism:(?-xism:(?>[^()\\]+))|(?-xism:\\(?-xism:[^
\x0A\x0D]))|(?-xism:\s*\((?:\s*(?-xism:(?-xism:(?>[^()\\]+))
|(?-xism:\\(?-xism:[^\x0A\x0D]))|)+)*\s*\)\s*))+)*\s*\)\s*)+
|\s+)*[^\x00-\x1F\x7F()<>\[\]:;@\,.<DQ>\s]+(?-xism:(?-xism:\
s*\((?:\s*(?-xism:(?-xism:(?>[^()\\]+))|(?-xism:\\(?-xism:[^
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|(?-xism:\\(?-xism:[^\x0A\x0D]))|)+)*\s*\)\s*))+)*\s*\)\s*)+
|\s+)*)|(?-xism:(?-xism:(?-xism:\s*\((?:\s*(?-xism:(?-xism:(
?>[^()\\]+))|(?-xism:\\(?-xism:[^\x0A\x0D]))|(?-xism:\s*\((?
:\s*(?-xism:(?-xism:(?>[^()\\]+))|(?-xism:\\(?-xism:[^\x0A\x
0D]))|)+)*\s*\)\s*))+)*\s*\)\s*)+|\s+)*<DQ>(?-xism:(?-xism:[
^\\<DQ>])|(?-xism:\\(?-xism:[^\x0A\x0D])))+<DQ>(?-xism:(?-xi
sm:\s*\((?:\s*(?-xism:(?-xism:(?>[^()\\]+))|(?-xism:\\(?-xis
m:[^\x0A\x0D]))|(?-xism:\s*\((?:\s*(?-xism:(?-xism:(?>[^()\\
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s*)+|\s+)*))+)?(?-xism:(?-xism:(?-xism:\s*\((?:\s*(?-xism:(?
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ism:\\(?-xism:[^\x0A\x0D]))|)+)*\s*\)\s*))+)*\s*\)\s*)+|\s+)
*<DQ>(?-xism:(?-xism:[^\\<DQ>])|(?-xism:\\(?-xism:[^\x0A\x0D
])))+<DQ>(?-xism:(?-xism:\s*\((?:\s*(?-xism:(?-xism:(?>[^()\
\]+))|(?-xism:\\(?-xism:[^\x0A\x0D]))|(?-xism:\s*\((?:\s*(?-
xism:(?-xism:(?>[^()\\]+))|(?-xism:\\(?-xism:[^\x0A\x0D]))|)
+)*\s*\)\s*))+)*\s*\)\s*)+|\s+)*))\@(?-xism:(?-xism:(?-xism:
(?-xism:\s*\((?:\s*(?-xism:(?-xism:(?>[^()\\]+))|(?-xism:\\(
?-xism:[^\x0A\x0D]))|(?-xism:\s*\((?:\s*(?-xism:(?-xism:(?>[
^()\\]+))|(?-xism:\\(?-xism:[^\x0A\x0D]))|)+)*\s*\)\s*))+)*\
s*\)\s*)+|\s+)*(?-xism:[^\x00-\x1F\x7F()<>\[\]:;@\,.<DQ>\s]+
(?:\.[^\x00-\x1F\x7F()<>\[\]:;@\,.<DQ>\s]+)*)(?-xism:(?-xism
:\s*\((?:\s*(?-xism:(?-xism:(?>[^()\\]+))|(?-xism:\\(?-xism:
[^\x0A\x0D]))|(?-xism:\s*\((?:\s*(?-xism:(?-xism:(?>[^()\\]+
))|(?-xism:\\(?-xism:[^\x0A\x0D]))|)+)*\s*\)\s*))+)*\s*\)\s*
)+|\s+)*)|(?-xism:(?-xism:(?-xism:\s*\((?:\s*(?-xism:(?-xism
:(?>[^()\\]+))|(?-xism:\\(?-xism:[^\x0A\x0D]))|(?-xism:\s*\(
(?:\s*(?-xism:(?-xism:(?>[^()\\]+))|(?-xism:\\(?-xism:[^\x0A
\x0D]))|)+)*\s*\)\s*))+)*\s*\)\s*)+|\s+)*\[(?:\s*(?-xism:(?-
xism:[^\[\]\\])|(?-xism:\\(?-xism:[^\x0A\x0D])))+)*\s*\](?-x
ism:(?-xism:\s*\((?:\s*(?-xism:(?-xism:(?>[^()\\]+))|(?-xism
:\\(?-xism:[^\x0A\x0D]))|(?-xism:\s*\((?:\s*(?-xism:(?-xism:
(?>[^()\\]+))|(?-xism:\\(?-xism:[^\x0A\x0D]))|)+)*\s*\)\s*))
+)*\s*\)\s*)+|\s+)*))))(?-xism:\s*\((?:\s*(?-xism:(?-xism:(?
>[^()\\]+))|(?-xism:\\(?-xism:[^\x0A\x0D]))|(?-xism:\s*\((?:
\s*(?-xism:(?-xism:(?>[^()\\]+))|(?-xism:\\(?-xism:[^\x0A\x0
D]))|)+)*\s*\)\s*))+)*\s*\)\s*)*)"
  .Replace("<DQ>", "\"")
  .Replace("\t", "")
  .Replace(" ", "")
  .Replace("\r", "")
  .Replace("\n", "");

private static Regex mailbox =
  new Regex(gibberish, RegexOptions.ExplicitCapture);

这个简单的模式适用于我：

^(?<name>[^<>#()\.,;\s@\"]{1,})@(?<domain>[^<>#()\.,;\s@\"]{2,}\.(?<top>[^<>#()\.,;:\s@\"]{2,}))$

我找到了一个符合RFC 2822的正则表达式。RFC 5322的先前标准。这个正则表达式表现得相当好，将覆盖大多数情况，但是随着RFC 5322成为标准，可能会有一些漏洞需要堵塞。

^(?:[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])?|\[(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?|[a-z0-9-]*[a-z0-9]:(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21-\x5a\x53-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])+)\])$

文档中说，您不应该使用上面的正则表达式，而是倾向于这种风格，这有点容易管理。

[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?

我注意到这是区分大小写的，所以我实际上对这个平台做了修改。

^[a-zA-Z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-zA-Z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-zA-Z0-9](?:[a-zA-Z0-9-]*[a-zA-Z0-9])?\.)+[a-zA-Z0-9](?:[a-zA-Z0-9-]*[a-zA-Z0-9])?$

如果你想改进一个多年来运行良好的正则表达式，那么答案就取决于你到底想要实现什么——哪些类型的电子邮件地址出现了问题。微调电子邮件正则表达式非常困难，我还没有找到一个完美的解决方案。

如果您的应用程序涉及一些非常技术性的内容（或组织内部的内容），那么您可能需要支持IP地址，而不是域名，或电子邮件地址“本地”部分的注释。如果您的应用程序是跨国的，我会考虑关注Unicode和UTF-8支持。

您问题的主要答案目前链接到“完全符合RFC‑822的正则表达式”。然而，尽管该正则表达式很复杂，并且假定它在RFC规则中注重细节，但它在Unicode支持方面完全失败。

我为大多数应用程序编写的正则表达式侧重于Unicode支持，以及对RFC标准的总体遵守：

/^(?!\.)((?!.*\.{2})[a-zA-Z0-9\u0080-\u00FF\u0100-\u017F\u0180-\u024F\u0250-\u02AF\u0300-\u036F\u0370-\u03FF\u0400-\u04FF\u0500-\u052F\u0530-\u058F\u0590-\u05FF\u0600-\u06FF\u0700-\u074F\u0750-\u077F\u0780-\u07BF\u07C0-\u07FF\u0900-\u097F\u0980-\u09FF\u0A00-\u0A7F\u0A80-\u0AFF\u0B00-\u0B7F\u0B80-\u0BFF\u0C00-\u0C7F\u0C80-\u0CFF\u0D00-\u0D7F\u0D80-\u0DFF\u0E00-\u0E7F\u0E80-\u0EFF\u0F00-\u0FFF\u1000-\u109F\u10A0-\u10FF\u1100-\u11FF\u1200-\u137F\u1380-\u139F\u13A0-\u13FF\u1400-\u167F\u1680-\u169F\u16A0-\u16FF\u1700-\u171F\u1720-\u173F\u1740-\u175F\u1760-\u177F\u1780-\u17FF\u1800-\u18AF\u1900-\u194F\u1950-\u197F\u1980-\u19DF\u19E0-\u19FF\u1A00-\u1A1F\u1B00-\u1B7F\u1D00-\u1D7F\u1D80-\u1DBF\u1DC0-\u1DFF\u1E00-\u1EFF\u1F00-\u1FFFu20D0-\u20FF\u2100-\u214F\u2C00-\u2C5F\u2C60-\u2C7F\u2C80-\u2CFF\u2D00-\u2D2F\u2D30-\u2D7F\u2D80-\u2DDF\u2F00-\u2FDF\u2FF0-\u2FFF\u3040-\u309F\u30A0-\u30FF\u3100-\u312F\u3130-\u318F\u3190-\u319F\u31C0-\u31EF\u31F0-\u31FF\u3200-\u32FF\u3300-\u33FF\u3400-\u4DBF\u4DC0-\u4DFF\u4E00-\u9FFF\uA000-\uA48F\uA490-\uA4CF\uA700-\uA71F\uA800-\uA82F\uA840-\uA87F\uAC00-\uD7AF\uF900-\uFAFF\.!#$%&'*+-/=?^_`{|}~\-\d]+)@(?!\.)([a-zA-Z0-9\u0080-\u00FF\u0100-\u017F\u0180-\u024F\u0250-\u02AF\u0300-\u036F\u0370-\u03FF\u0400-\u04FF\u0500-\u052F\u0530-\u058F\u0590-\u05FF\u0600-\u06FF\u0700-\u074F\u0750-\u077F\u0780-\u07BF\u07C0-\u07FF\u0900-\u097F\u0980-\u09FF\u0A00-\u0A7F\u0A80-\u0AFF\u0B00-\u0B7F\u0B80-\u0BFF\u0C00-\u0C7F\u0C80-\u0CFF\u0D00-\u0D7F\u0D80-\u0DFF\u0E00-\u0E7F\u0E80-\u0EFF\u0F00-\u0FFF\u1000-\u109F\u10A0-\u10FF\u1100-\u11FF\u1200-\u137F\u1380-\u139F\u13A0-\u13FF\u1400-\u167F\u1680-\u169F\u16A0-\u16FF\u1700-\u171F\u1720-\u173F\u1740-\u175F\u1760-\u177F\u1780-\u17FF\u1800-\u18AF\u1900-\u194F\u1950-\u197F\u1980-\u19DF\u19E0-\u19FF\u1A00-\u1A1F\u1B00-\u1B7F\u1D00-\u1D7F\u1D80-\u1DBF\u1DC0-\u1DFF\u1E00-\u1EFF\u1F00-\u1FFF\u20D0-\u20FF\u2100-\u214F\u2C00-\u2C5F\u2C60-\u2C7F\u2C80-\u2CFF\u2D00-\u2D2F\u2D30-\u2D7F\u2D80-\u2DDF\u2F00-\u2FDF\u2FF0-\u2FFF\u3040-\u309F\u30A0-\u30FF\u3100-\u312F\u3130-\u318F\u3190-\u319F\u31C0-\u31EF\u31F0-\u31FF\u3200-\u32FF\u3300-\u33FF\u3400-\u4DBF\u4DC0-\u4DFF\u4E00-\u9FFF\uA000-\uA48F\uA490-\uA4CF\uA700-\uA71F\uA800-\uA82F\uA840-\uA87F\uAC00-\uD7AF\uF900-\uFAFF\-\.\d]+)((\.([a-zA-Z\u0080-\u00FF\u0100-\u017F\u0180-\u024F\u0250-\u02AF\u0300-\u036F\u0370-\u03FF\u0400-\u04FF\u0500-\u052F\u0530-\u058F\u0590-\u05FF\u0600-\u06FF\u0700-\u074F\u0750-\u077F\u0780-\u07BF\u07C0-\u07FF\u0900-\u097F\u0980-\u09FF\u0A00-\u0A7F\u0A80-\u0AFF\u0B00-\u0B7F\u0B80-\u0BFF\u0C00-\u0C7F\u0C80-\u0CFF\u0D00-\u0D7F\u0D80-\u0DFF\u0E00-\u0E7F\u0E80-\u0EFF\u0F00-\u0FFF\u1000-\u109F\u10A0-\u10FF\u1100-\u11FF\u1200-\u137F\u1380-\u139F\u13A0-\u13FF\u1400-\u167F\u1680-\u169F\u16A0-\u16FF\u1700-\u171F\u1720-\u173F\u1740-\u175F\u1760-\u177F\u1780-\u17FF\u1800-\u18AF\u1900-\u194F\u1950-\u197F\u1980-\u19DF\u19E0-\u19FF\u1A00-\u1A1F\u1B00-\u1B7F\u1D00-\u1D7F\u1D80-\u1DBF\u1DC0-\u1DFF\u1E00-\u1EFF\u1F00-\u1FFF\u20D0-\u20FF\u2100-\u214F\u2C00-\u2C5F\u2C60-\u2C7F\u2C80-\u2CFF\u2D00-\u2D2F\u2D30-\u2D7F\u2D80-\u2DDF\u2F00-\u2FDF\u2FF0-\u2FFF\u3040-\u309F\u30A0-\u30FF\u3100-\u312F\u3130-\u318F\u3190-\u319F\u31C0-\u31EF\u31F0-\u31FF\u3200-\u32FF\u3300-\u33FF\u3400-\u4DBF\u4DC0-\u4DFF\u4E00-\u9FFF\uA000-\uA48F\uA490-\uA4CF\uA700-\uA71F\uA800-\uA82F\uA840-\uA87F\uAC00-\uD7AF\uF900-\uFAFF]){2,63})+)$/i

我将避免复制粘贴完整的答案，所以我只将此链接到我在这里提供的类似答案：如何验证unicode电子邮件？

上面的正则表达式也有一个现场演示：http://jsfiddle.net/aossikine/qCLVH/3/