What is the best Java email address validation method

Question

What are the good email address validation libraries for Java   Are there any alternatives to commons validator

User · Answer

If you re looking to verify whether an email address is valid  then VRFY will get you some of the way  I ve found it s useful for validating intranet addresses  that is  email addresses for internal sites   However it s less useful for internet mail servers  see the caveats at the top of this page

User · Answer

Another option is use the Hibernate email validator  using the annotation  Email or using the validator class programatically  like   import org hibernate validator internal constraintvalidators hv EmailValidator    class Validator          code     private boolean isValidEmail String email            EmailValidator emailValidator   new EmailValidator            return emailValidator isValid email  null

User · Answer

Using the official java email package is the easiest    public static boolean isValidEmailAddress String email       boolean result   true     try         InternetAddress emailAddr   new InternetAddress email         emailAddr validate         catch  AddressException ex          result   false          return result

User · Answer

You may also want to check for the length - emails are a maximum of 254 chars long  I use the apache commons validator and it doesn t check for this

User · Answer

Apache Commons validator can be used as mentioned in the other answers.

pom.xml:

<dependency>
    <groupId>commons-validator</groupId>
    <artifactId>commons-validator</artifactId>
    <version>1.4.1</version>
</dependency>

build.gradle:

compile 'commons-validator:commons-validator:1.4.1'

The import:

import org.apache.commons.validator.routines.EmailValidator;

The code:

String email = "[email protected]";
boolean valid = EmailValidator.getInstance().isValid(email);

and to allow local addresses

boolean allowLocal = true;
boolean valid = EmailValidator.getInstance(allowLocal).isValid(email);

User · Answer

Late answer  but I think it is simple and worthy       public boolean isValidEmailAddress String email               String ePattern      a-zA-Z0-9      amp              -         0-9  1 3     0-9  1 3     0-9  1 3     0-9  1 3         a-zA-Z  -0-9        a-zA-Z  2                   java util regex Pattern p   java util regex Pattern compile ePattern              java util regex Matcher m   p matcher email              return m matches            Test Cases     For production purpose  Domain Name validations should be performed network-wise

User · Answer

Les Hazlewood has written a very thorough RFC 2822 compliant email validator class using Java regular expressions  You can find it at http   www leshazlewood com  p 23  However  its thoroughness  or the Java RE implementation  leads to inefficiency - read the comments about parsing times for long addresses

User · Answer

Late to the question  here  but  I maintain a class at this address  http   lacinato com cm software emailrelated emailaddress  It is based on Les Hazlewood s class  but has numerous improvements and fixes a few bugs  Apache license   I believe it is the most capable email parser in Java  and I have yet to see one more capable in any language  though there may be one out there  It s not a lexer-style parser  but uses some complicated java regex  and thus is not as efficient as it could be  but my company has parsed well over 10 billion real-world addresses with it  it s certainly usable in a high-performance situation  Maybe once a year it ll hit an address that causes a regex stack overflow  appropriately   but these are spam addresses which are hundreds or thousands of characters long with many many quotes and parenthesis and the like   RFC 2822 and the related specs are really quite permissive in terms of email addresses  so a class like this is overkill for most uses  For example  the following is a legitimate address  according to spec  spaces and all     lt bob     here     lt   hi there   bob the man smith   hi     there  example com  hello   gt   again    No mail server would allow that  but this class can parse it  and rewrite it to a usable form    We found the existing Java email parser options to be insufficiently durable  meaning  all of them could not parse some valid addresses   so we created this class   The code is well-documented and has a lot of easy-to-change options to allow or disallow certain email forms  It also provides a lot of methods to access certain parts of the address  left-hand side  right-hand side  personal names  comments  etc   to parse validate mailbox-list headers  to parse validate the return-path  which is unique among the headers   and so forth   The code as written has a javamail dependency  but it s easy to remove if you don t want the minor functionality it provides

User · Answer

Heres my pragmatic approach  where I just want reasonable distinct blah domain addresses using the allowable characters from the RFC  Addresses must be converted to lowercase beforehand   public class EmailAddressValidator        private static final String domainChars    a-z0-9  -       private static final String atomChars    a-z0-9  Q     amp    -            E       private static final String emailRegex         dot atomChars          dot domainChars             private static final Pattern emailPattern   Pattern compile emailRegex        private static String dot String chars            return       chars                 chars                      public static boolean isValidEmailAddress String address            return address    null  amp  amp  emailPattern matcher address  matches

User · Answer

Apache Commons is generally known as a solid project   Keep in mind  though  you ll still have to send a verification email to the address if you want to ensure it s a real email  and that the owner wants it used on your site   EDIT  There was a bug where it was too restrictive on domain  causing it to not accept valid emails from new TLDs  This bug was resolved on 03 Jan 15 02 48 in commons-validator version 1 4 1

User · Answer

I ported some of the code in Zend Validator Email    FacesValidator  emailValidator   public class EmailAddressValidator implements Validator        private String localPart      private String hostName      private boolean domain   true       Locale locale      ResourceBundle bundle       private List lt FacesMessage gt  messages   new ArrayList lt FacesMessage gt          private HostnameValidator hostnameValidator        Override     public void validate FacesContext context  UIComponent component  Object value  throws ValidatorException           setOptions component           String email       String  value          boolean result    true          Pattern pattern   Pattern compile                                Matcher matcher   pattern matcher email            locale   context getViewRoot   getLocale            bundle   ResourceBundle getBundle  com myapp resources validationMessages   locale            boolean length   true          boolean local    true           if  matcher find                  localPart     matcher group 1               hostName      matcher group 2                if  localPart length    gt  64    hostName length    gt  255                    length            false                  addMessage  enterValidEmail    email AddressLengthExceeded                                if  domain    true                    hostnameValidator   new HostnameValidator                    hostnameValidator validate context  component  hostName                              local   validateLocalPart                 if  local  amp  amp  length                    result   true                else                   result   false                           else               result            false              addMessage  enterValidEmail    invalidEmailAddress                       if  result    false                throw new ValidatorException messages                         private boolean validateLocalPart                First try to match the local part on the common dot-atom format         boolean result   false              Dot-atom characters are  1 atext       1 atext             atext  ALPHA   DIGIT   and                       amp                                      -                                                            String atext    a-zA-Z0-9  u0021  u0023  u0024  u0025  u0026  u0027  u002a                       u002b  u002d  u002f  u003d  u003f  u005e  u005f  u0060  u007b                       u007c  u007d  u007e           Pattern regex   Pattern compile      atext       u002e    atext                   Matcher matcher   regex matcher localPart           if  matcher find                  result   true            else                  Try quoted string format                 Quoted-string characters are  DQUOTE    FWS  qtext quoted-pair   FWS  DQUOTE                qtext  Non white space controls  and the rest of the US-ASCII characters not                  including     or the quote character             String noWsCtl      u0001-  u0008  u000b  u000c  u000e-  u001f  u007f               String qText   noWsCtl      u0021  u0023-  u005b  u005d-  u007e               String ws      u0020  u0009                regex   Pattern compile     u0022    ws qText        ws      u0022                 matcher   regex matcher localPart               if  matcher find                      result   true                else                   addMessage  enterValidEmail    email AddressDotAtom                    addMessage  enterValidEmail    email AddressQuotedString                    addMessage  enterValidEmail    email AddressInvalidLocalPart                                     return result             private void addMessage String detail  String summary            String detailMsg   bundle getString detail           String summaryMsg   bundle getString summary           messages add new FacesMessage FacesMessage SEVERITY ERROR  summaryMsg  detailMsg               private void setOptions UIComponent component            Boolean domainOption   Boolean valueOf  String  component getAttributes   get  domain               domain    domainOption    null    true   domainOption booleanValue              With a hostname validator as follows    FacesValidator  hostNameValidator   public class HostnameValidator implements Validator        private Locale locale      private ResourceBundle bundle      private List lt FacesMessage gt  messages      private boolean checkTld   true      private boolean allowLocal   false      private boolean allowDNS   true      private String tld      private String   validTlds     ac    ad    ae    aero    af    ag    ai            al    am    an    ao    aq    ar    arpa    as    asia    at    au            aw    ax    az    ba    bb    bd    be    bf    bg    bh    bi    biz            bj    bm    bn    bo    br    bs    bt    bv    bw    by    bz    ca            cat    cc    cd    cf    cg    ch    ci    ck    cl    cm    cn    co            com    coop    cr    cu    cv    cx    cy    cz    de    dj    dk            dm    do    dz    ec    edu    ee    eg    er    es    et    eu    fi            fj    fk    fm    fo    fr    ga    gb    gd    ge    gf    gg    gh            gi    gl    gm    gn    gov    gp    gq    gr    gs    gt    gu    gw            gy    hk    hm    hn    hr    ht    hu    id    ie    il    im    in            info    int    io    iq    ir    is    it    je    jm    jo    jobs            jp    ke    kg    kh    ki    km    kn    kp    kr    kw    ky    kz            la    lb    lc    li    lk    lr    ls    lt    lu    lv    ly    ma            mc    md    me    mg    mh    mil    mk    ml    mm    mn    mo            mobi    mp    mq    mr    ms    mt    mu    museum    mv    mw    mx            my    mz    na    name    nc    ne    net    nf    ng    ni    nl            no    np    nr    nu    nz    om    org    pa    pe    pf    pg    ph            pk    pl    pm    pn    pr    pro    ps    pt    pw    py    qa    re            ro    rs    ru    rw    sa    sb    sc    sd    se    sg    sh    si            sj    sk    sl    sm    sn    so    sr    st    su    sv    sy    sz            tc    td    tel    tf    tg    th    tj    tk    tl    tm    tn    to            tp    tr    travel    tt    tv    tw    tz    ua    ug    uk    um            us    uy    uz    va    vc    ve    vg    vi    vn    vu    wf    ws            ye    yt    yu    za    zm    zw        private Map lt String  Map lt Integer  Integer gt  gt  idnLength       private void init             Map lt Integer  Integer gt  biz   new HashMap lt Integer  Integer gt             biz put 5  17           biz put 11  15           biz put 12  20            Map lt Integer  Integer gt  cn   new HashMap lt Integer  Integer gt             cn put 1  20            Map lt Integer  Integer gt  com   new HashMap lt Integer  Integer gt             com put 3  17           com put 5  20            Map lt Integer  Integer gt  hk   new HashMap lt Integer  Integer gt             hk put 1  15            Map lt Integer  Integer gt  info   new HashMap lt Integer  Integer gt             info put 4  17            Map lt Integer  Integer gt  kr   new HashMap lt Integer  Integer gt             kr put 1  17            Map lt Integer  Integer gt  net   new HashMap lt Integer  Integer gt             net put 3  17           net put 5  20            Map lt Integer  Integer gt  org   new HashMap lt Integer  Integer gt             org put 6  17            Map lt Integer  Integer gt  tw   new HashMap lt Integer  Integer gt             tw put 1  20            Map lt Integer  Integer gt  idn1   new HashMap lt Integer  Integer gt             idn1 put 1  20            Map lt Integer  Integer gt  idn2   new HashMap lt Integer  Integer gt             idn2 put 1  20            Map lt Integer  Integer gt  idn3   new HashMap lt Integer  Integer gt             idn3 put 1  20            Map lt Integer  Integer gt  idn4   new HashMap lt Integer  Integer gt             idn4 put 1  20            idnLength   new HashMap lt String  Map lt Integer  Integer gt  gt              idnLength put  BIZ   biz           idnLength put  CN   cn           idnLength put  COM   com           idnLength put  HK   hk           idnLength put  INFO   info           idnLength put  KR   kr           idnLength put  NET   net           idnLength put  ORG   org           idnLength put  TW   tw           idnLength put          idn1           idnLength put       idn2           idnLength put       idn3           idnLength put       idn4            messages   new ArrayList lt FacesMessage gt                public HostnameValidator             init                Override     public void validate FacesContext context  UIComponent component  Object value  throws ValidatorException           String hostName    String  value           locale   context getViewRoot   getLocale            bundle   ResourceBundle getBundle  com myapp resources validationMessages   locale            Pattern ipPattern   Pattern compile    0-9a-f          Pattern CASE INSENSITIVE           Matcher ipMatcher   ipPattern matcher hostName           if  ipMatcher find                  addMessage  hostname IpAddressNotAllowed                throw new ValidatorException messages                      boolean result   false              removes last dot     from hostname          hostName   hostName replaceAll                         String   domainParts   hostName split                  boolean status   false              Check input against DNS hostname schema         if   domainParts length  gt  1   amp  amp   hostName length    gt  4   amp  amp   hostName length    lt  255                 status   false               dowhile              do                      First check TLD                 int lastIndex   domainParts length - 1                  String domainEnding   domainParts lastIndex                   Pattern tldRegex   Pattern compile        2 10     Pattern CASE INSENSITIVE                   Matcher tldMatcher   tldRegex matcher domainEnding                   if  tldMatcher find      domainEnding equals                                     domainEnding equals                                  domainEnding equals                                  domainEnding equals                                    Hostname characters are    label dot  label dot label   max 254 chars                        label  id-prefix   ldh 61  id-prefix   max 63 chars                        id-prefix  alpha   digit                        ldh  alpha   digit   dash                         Match TLD against known list                     tld    String  tldMatcher group 1  toLowerCase   trim                        if  checkTld    true                            boolean foundTld   false                          for  int i   0  i  lt  validTlds length  i                                  if  tld equals validTlds i                                      foundTld   true                                                                                   if  foundTld    false                                status   false                              addMessage  hostname UnknownTld                                break dowhile                                                                                                  Match against IDN hostnames                        Note  Keep label regex short to avoid issues with long patterns when matching IDN hostnames                                             List lt String gt  regexChars   getIdnRegexChars                            Check each hostname part                     int check   0                      for  String domainPart   domainParts                               Decode Punycode domainnames to IDN                         if  domainPart indexOf  xn--      0                                domainPart   decodePunycode domainPart substring 4                                                          Check dash  -  does not start  end or appear in 3rd and 4th positions                         if  domainPart indexOf  -      0                                     domainPart length    gt  2  amp  amp  domainPart indexOf  -   2     2  amp  amp  domainPart indexOf  -   3     3                                      domainPart indexOf  -       domainPart length   - 1                                  status   false                              addMessage  hostname DashCharacter                                break dowhile                                                        Check each domain part                         boolean checked   false                           for  int key   0  key  lt  regexChars size    key                                  String regexChar   regexChars get key                               Pattern regex   Pattern compile regexChar                               Matcher regexMatcher   regex matcher domainPart                               status   regexMatcher find                                if  status                                    int length   63                                   if  idnLength containsKey tld toUpperCase                                             amp  amp  idnLength get tld toUpperCase    containsKey key                                         length   idnLength get tld toUpperCase    get key                                                                      int utf8Length                                  try                                       utf8Length   domainPart getBytes  UTF8   length                                      if  utf8Length  gt  length                                            addMessage  hostname InvalidHostname                                          else                                           checked   true                                          break                                                                          catch  UnsupportedEncodingException ex                                        Logger getLogger HostnameValidator class getName    log Level SEVERE  null  ex                                                                                                                         if  checked                                  check                                                                          If one of the labels doesn t match  the hostname is invalid                     if  check    domainParts length                            status   false                          addMessage  hostname InvalidHostnameSchema                                             else                          Hostname not long enough                     status   false                      addMessage  hostname UndecipherableTld                                     while  false                if  status    true  amp  amp  allowDNS                    result   true                           else if  allowDNS    true                addMessage  hostname InvalidHostname                throw new ValidatorException messages                         Check input against local network name schema          Pattern regexLocal   Pattern compile      a-zA-Z0-9  x2d  1 63   x2e   a-zA-Z0-9  x2d  1 63   1 254     Pattern CASE INSENSITIVE           boolean checkLocal   regexLocal matcher hostName  find            if  allowLocal  amp  amp   status                if  checkLocal                    result   true                else                      If the input does not pass as a local network name  add a message                 result   false                  addMessage  hostname InvalidLocalName                                         If local network names are not allowed  add a message         if  checkLocal  amp  amp   allowLocal  amp  amp   status                result   false              addMessage  hostname LocalNameNotAllowed                       if  result    false                throw new ValidatorException messages                         private void addMessage String msg            String bundlMsg   bundle getString msg           messages add new FacesMessage FacesMessage SEVERITY ERROR  bundlMsg  bundlMsg                          Returns a list of regex patterns for the matched TLD         param tld         return              private List lt String gt  getIdnRegexChars             List lt String gt  regexChars   new ArrayList lt String gt             regexChars add    a-z0-9  x2d  1 63              Document doc   null          DocumentBuilderFactory factory   DocumentBuilderFactory newInstance            factory setNamespaceAware true            try               InputStream validIdns   getClass   getClassLoader   getResourceAsStream  com myapp resources validIDNs 1 xml                DocumentBuilder builder   factory newDocumentBuilder                doc   builder parse validIdns               doc getDocumentElement   normalize              catch  SAXException ex                Logger getLogger HostnameValidator class getName    log Level SEVERE  null  ex             catch  IOException ex                Logger getLogger HostnameValidator class getName    log Level SEVERE  null  ex             catch  ParserConfigurationException ex                Logger getLogger HostnameValidator class getName    log Level SEVERE  null  ex                         prepare XPath         XPath xpath   XPathFactory newInstance   newXPath             NodeList nodes   null          String xpathRoute      idn tld       tld toUpperCase          pattern text              try               XPathExpression expr              expr   xpath compile xpathRoute               Object res   expr evaluate doc  XPathConstants NODESET               nodes    NodeList  res            catch  XPathExpressionException ex                Logger getLogger HostnameValidator class getName    log Level SEVERE  null  ex                       for  int i   0  i  lt  nodes getLength    i                  regexChars add nodes item i  getNodeValue                        return regexChars                        Decode Punycode string         param encoded         return                  private String decodePunycode String encoded            Pattern regex   Pattern compile     a-z0-9  x2d  1 10     Pattern CASE INSENSITIVE           Matcher matcher   regex matcher encoded           boolean found   matcher find             if  encoded isEmpty      found                   no punycode encoded string  return as is             addMessage  hostname CannotDecodePunycode                throw new ValidatorException messages                      int separator   encoded lastIndexOf  -                List lt Integer gt  decoded   new ArrayList lt Integer gt             if  separator  gt  0                for  int x   0  x  lt  separator    x                    decoded add  int  encoded charAt x                            else               addMessage  hostname CannotDecodePunycode                throw new ValidatorException messages                      int lengthd   decoded size            int lengthe   encoded length                decoding         boolean init   true          int base   72          int index   0          int ch   0x80           int indexeStart    separator    1     separator   1    0          for  int indexe   indexeStart  indexe  lt  lengthe    lengthd                int oldIndex   index              int pos   1              for  int key   36  true  key    36                    int hex    int  encoded charAt indexe                     int digit    hex - 48  lt  10    hex - 22                             hex - 65  lt  26    hex - 65                             hex - 97  lt  26    hex - 97                           36                     index    digit   pos                  int tag    key  lt   base    1     key  gt   base   26    26    key - base                    if  digit  lt  tag                        break                                    pos    int   pos    36 - tag                              int delta    int   init     index - oldIndex    700      index - oldIndex    2                delta     int   delta    lengthd   1                int key              for  key   0  delta  gt  910  key    36                    delta    int   delta   35                             base    int   key   36   delta    delta   38                init   false              ch     int   index    lengthd   1                index     lengthd   1               if  lengthd  gt  0                    for  int i   lengthd  i  gt  index  i--                        decoded set i  decoded get i - 1                                                 decoded set index    ch                         convert decoded ucs4 to utf8 string         StringBuilder sb   new StringBuilder            for  int i   0  i  lt  decoded size    i                  int value   decoded get i               if  value  lt  128                    sb append  char  value                 else if  value  lt   1  lt  lt  11                     sb append  char   192    value  gt  gt  6                     sb append  char   128    value  amp  63                   else if  value  lt   1  lt  lt  16                     sb append  char   224    value  gt  gt  12                     sb append  char   128     value  gt  gt  6   amp  63                     sb append  char   128    value  amp  63                   else if  value  lt   1  lt  lt  21                     sb append  char   240    value  gt  gt  18                     sb append  char   128     value  gt  gt  12   amp  63                     sb append  char   128     value  gt  gt  6   amp  63                     sb append  char   128    value  amp  63                   else                   addMessage  hostname CannotDecodePunycode                    throw new ValidatorException messages                                    return sb toString                           Eliminates empty values from input array         param data         return              private String   verifyArray String   data            List lt String gt  result   new ArrayList lt String gt             for  String s   data                if   s equals                        result add s                                    return result toArray new String result size                And a validIDNs xml with regex patterns for the different tlds  too big to include     lt idnlist gt       lt idn gt           lt tld gt AC lt  tld gt           lt pattern gt    u002d0-9a-z  -    -  aaaccccddeeeeggghhiijklll lnnn o  rrrsss  tttuuuuuwyzz    1 63   lt  pattern gt       lt  idn gt       lt idn gt           lt tld gt AR lt  tld gt           lt pattern gt    u002d0-9a-z  -    -        -      1 63   lt  pattern gt       lt  idn gt       lt idn gt           lt tld gt AS lt  tld gt           lt pattern gt     u002d0-9a-z  -    -  aaaccccddeeeeegggghhiiiiijk llllnnn ooo  rrrsss  tttuuuuuuwyzz  1 63   lt  pattern gt       lt  idn gt       lt idn gt           lt tld gt AT lt  tld gt           lt pattern gt     u002d0-9a-z  -    -          1 63   lt  pattern gt       lt  idn gt       lt idn gt           lt tld gt BIZ lt  tld gt           lt pattern gt    u002d0-9a-z                1 63   lt  pattern gt           lt pattern gt    u002d0-9a-z                1 63   lt  pattern gt           lt pattern gt    u002d0-9a-z              ou  1 63   lt  pattern gt       lt  id gt   lt  idlist gt

User · Answer

public class Validations        private Pattern regexPattern      private Matcher regMatcher       public String validateEmailAddress String emailAddress             regexPattern   Pattern compile     a-zA-Z-0-9-               a-z-A-z        a-zA-z   2 3              regMatcher     regexPattern matcher emailAddress           if regMatcher matches                  return  Valid Email Address             else               return  Invalid Email Address                        public String validateMobileNumber String mobileNumber            regexPattern   Pattern compile       0-9  2 3  - 0-9  10              regMatcher     regexPattern matcher mobileNumber           if regMatcher matches                  return  Valid Mobile Number             else               return  Invalid Mobile Number                        public static void main String   args             String emailAddress    suryaprakash pisay gmail com           String mobileNumber     91-9986571622           Validations validations   new Validations            System out println validations validateEmailAddress emailAddress            System out println validations validateMobileNumber mobileNumber

User · Answer

This is the best method   public static boolean isValidEmail String enteredEmail           String EMAIL REGIX          w     amp               -               w     amp               -         a-zA-Z0-9-          a-zA-Z  2 6             Pattern pattern   Pattern compile EMAIL REGIX           Matcher matcher   pattern matcher enteredEmail           return    enteredEmail isEmpty     amp  amp   enteredEmail  null   amp  amp   matcher matches              Sources - http   howtodoinjava com 2014 11 11 java-regex-validate-email-address   http   www rfc-editor org rfc rfc5322 txt

User · Answer

If you are trying to do a form validation received from the client  or just a bean validation - keep it simple  It s better to do a loose email validation rather than to do a strict one and reject some people   e g  when they are trying to register for your web service   With almost anything allowed in the username part of the email and so many new domains being added literally every month  e g   company   entreprise   estate   it s safer not to be restrictive   Pattern pattern   Pattern compile                  Matcher matcher   pattern matcher email

User · Answer

There don t seem to be any perfect libraries or ways to do this yourself  unless you have to time to send an email to the email address and wait for a response  this might not be an option though   I ended up using a suggestion from here  http   blog logichigh com 2010 09 02 validating-an-e-mail-address     and adjusting the code so it would work in Java   public static boolean isValidEmailAddress String email        boolean stricterFilter   true       String stricterFilterString     A-Z0-9a-z    -    A-Za-z0-9 -      A-Za-z  2 4        String laxString             A-Za-z  2  A-Za-z         String emailRegex   stricterFilter   stricterFilterString   laxString      java util regex Pattern p   java util regex Pattern compile emailRegex       java util regex Matcher m   p matcher email       return m matches

User · Answer

Although there are many alternatives to Apache commons, their implementations are rudimentary at best (like Apache commons' implementation itself) and even dead wrong in other cases.

I'd also stay away from so called simple 'non-restrictive' regex; there's no such thing. For example @ is allowed multiple times depending on context, how do you know the required one is there? Simple regex won't understand it, even though the email should be valid. Anything more complex becomes error-prone or even contain hidden performance killers. How are you going to maintain something like this?

The only comprehensive RFC compliant regex based validator I'm aware of is email-rfc2822-validator with its 'refined' regex appropriately named Dragons.java. It supports only the older RFC-2822 spec though, although appropriate enough for modern needs (RFC-5322 updates it in areas already out of scope for daily use cases).

But really what you want is a lexer that properly parses a string and breaks it up into the component structure according to the RFC grammar. EmailValidator4J seems promising in that regard, but is still young and limited.

Another option you have is using a webservice such as Mailgun's battle-tested validation webservice or Mailboxlayer API (just took the first Google results). It is not strictly RFC compliant, but works well enough for modern needs.

User · Answer

What do you want to validate  The email address   The email address can only be checked for its format conformance  See the standard  RFC2822  Best way to do that is a regular expression  You will never know if really exists without sending an email   I checked the commons validator  It contains an org apache commons validator EmailValidator class  Seems to be a good starting point

User · Answer

Current Apache Commons Validator version is 1.3.1.

Class that validates is org.apache.commons.validator.EmailValidator. It has an import for org.apache.oro.text.perl.Perl5Util which is from a retired Jakarta ORO project.

BTW, I found that there is a 1.4 version, here are the API docs. On the site it says: "Last Published: 05 March 2008 | Version: 1.4-SNAPSHOT", but that's not final. Only way to build yourself (but this is a snapshot, not RELEASE) and use, or download from here. This means 1.4 has not been made final for three years (2008-2011). This is not in Apache's style. I'm looking for a better option, but didn't find one that is very adopted. I want to use something that is well tested, don't want to hit any bugs.

User · Answer

I m just wondering why nobody came up with  Email from Hibernate Validator s additional constraints  The validator itself is EmailValidator

[validation] What is the best Java email address validation method?

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