Java regex email

Question

First of all  I know that using regex for email is not recommended but I gotta test this out   I have this regex    b A-Z0-9   -    A-Z0-9 -     A-Z  2 4  b   In Java  I did this   Pattern p   Pattern compile    b A-Z0-9   -    A-Z0-9 -      A-Z  2 4   b    Matcher m   p matcher  foobar gmail com     if  m find        System out println  Correct       However  the regex fails regardless of whether the email is wel-formed or not  A  find and replace  inside Eclipse works fine with the same regex   Any idea   Thanks

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That s because you are forgetting case insensitivity     Pattern regex   Pattern compile    b   w  -    -   w      A-Za-z  2 4   b      This matches your example  although it ignores many valid e-mails

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If you use Java Bean Validation  an email can be validated with javax validation constraints Email annotation  If you want to do it manually  you can see how Hibernate Validator  Java Bean Validation implementation  done it  https   github com hibernate hibernate-validator blob master engine src main java org hibernate validator internal constraintvalidators AbstractEmailValidator java

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Here is RFC822 compliant regex adapted for Java   Pattern ptr   Pattern compile          r  n      t                 lt  gt                     000-  031             r  n      t      Z             lt  gt                                   r                    r  n      t              r  n      t                  r  n      t           lt  gt                     000-  031             r  n      t      Z             lt  gt                                   r                    r  n      t              r  n      t               r  n      t           lt  gt                     000-  031             r  n      t      Z             lt  gt                                    r                        r  n      t                  r  n      t           lt  gt                     000-  031             r  n      t      Z             lt  gt                                    r                        r  n      t               lt  gt                     000-  031             r  n      t      Z             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                    r  n      t                   r  n      t           lt  gt                     000-  031             r  n      t      Z             lt  gt                                    r                        r  n      t                  r  n      t           lt  gt                     000-  031             r  n      t      Z             lt  gt                                    r                        r  n      t                 r  n      t             lt  gt                     000-  031             r  n      t      Z             lt  gt                                   r                    r  n      t              r  n      t                  r  n      t           lt  gt                     000-  031             r  n      t      Z             lt  gt                                   r                    r  n      t              r  n      t               r  n      t           lt  gt                     000-  031             r  n      t      Z             lt  gt                                    r                        r  n      t                  r  n      t           lt  gt                     000-  031             r  n      t      Z             lt  gt                                    r                        r  n      t         gt         r  n      t           s      String   emails        Fred Bloggs   example com    user  invalid com    Chuck Norris  lt gmail chucknorris com gt     webmaster m  ller de    matteo 78 47 122 114     for  String email   emails        System out println email     is      ptr matcher email  matches      valid     invalid         Output    Fred Bloggs  example com is valid user  invalid com is invalid Chuck Norris  lt gmail chucknorris com gt  is valid webmaster m  ller de is valid matteo 78 47 122 114 is valid   The regex is taken from this post  Mail  RFC822  Address  regexp-based address validation  The results should coincide with online version

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You can checking if emails is valid or no by using this libreries  and of course you can add array for this folowing project   import org apache commons validator routines EmailValidator   public class Email      public static void main String   args           EmailValidator email   EmailVlidator getInstance            boolean val   email isValid  george parcks gmail com            System out println  Mail is    val           val   email isValid  hans riguer hotmsil com            System out print  Mail is    val              output     Mail is  true  Mail is   false

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Regex       w     amp              -         w     amp              -         a-zA-Z0-9-        a-zA-Z  2 6    public static boolean isValidEmailId String email            String emailPattern        w     amp               -           w     amp               -         a-zA-Z0-9-        a-zA-Z  2 6             Pattern p   Pattern compile emailPattern           Matcher m   p matcher email           return m matches

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String emailRegex     a-zA-Z0-9      a-zA-Z0-9    a-zA-Z  2 3      0 1  a-zA-Z     Pattern matches emailRegex  You Input Mail Id      This is the regex to match valid email addresses

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Regex for Facebook-like validation   public static final String REGEX EMAIL VALIDATION        w-            w        w-         w         a-zA-Z  2         Dto for Unit tests with Lombok     Data  Accessors chain   true   FieldDefaults level   AccessLevel PRIVATE  public class UserCreateDto         NotNull      Pattern regexp   REGEX EMAIL VALIDATION       Size min   1  max   254      String email      Valid invalid emails below with Unit tests   public class UserCreateValidationDtoTest    private static final String   VALID EMAILS   new String    email yahoo com    email-100 yahoo com            Email 100 yahoo com    email111 email com    email-100 email net            email 100 email com au    emAil 1 com    email gmail com com            email 100 gmail com    emAil-100 yahoo-test com    email 100 yahoo-test ABC CoM    private static final String   INVALID EMAILS   new String          example com    email 111            email    email  com my    email123 gmail     email123  com    email123  com com             email email com    email    gmAil com    eEmail    gmail com    email    com    email  2002 gmail com            email  gmail com    email email gmail com    email gmail com     private Validator validator    Before public void setUp   throws Exception       ValidatorFactory factory   Validation buildDefaultValidatorFactory        validator   factory getValidator        Test public void emailValidationShouldBeValid   throws Exception       Arrays stream VALID EMAILS               forEach email - gt                            Set lt ConstraintViolation lt UserCreateDto gt  gt  violations   validateEmail                                  new UserCreateDto   setEmail email                            System out println  Email      email      violations      violations                           Assert assertTrue violations isEmpty                                              Test public void emailValidationShouldBeNotValid   throws Exception       Arrays stream INVALID EMAILS               forEach email - gt                            Set lt ConstraintViolation lt UserCreateDto gt  gt  violations   validateEmail                                  new UserCreateDto   setEmail email                            System out println  Email      email      violations      violations                           Assert assertTrue  violations isEmpty                                              private Set lt ConstraintViolation lt UserCreateDto gt  gt  validateEmail UserCreateDto user        String emailFieldName    email       return validator validateProperty user  emailFieldName

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This is a valid regex for validating e-mails  It s totally compliant with RFC822 and accepts IP address and server names  for intranet purposes    public static boolean isEmailValid String email        final Pattern EMAIL REGEX   Pattern compile   a-z0-9     amp              -       a-z0-9     amp              -         a-z0-9     a-z0-9-   a-z0-9       a-z0-9     a-z0-9-   a-z0-9      Pattern CASE INSENSITIVE       return EMAIL REGEX matcher email  matches        Here are some output examples  when you call isEmailValid emailVariable    john somewhere com    valid john foo somewhere com    valid john foo label somewhere com    valid  with  label - Gmail accepts it   john 192 168 1 10    valid  with IP addresses  john label 192 168 1 10    valid  with  label and IP address  john foo someserver    valid  with no first domain level  JOHN FOO somewhere com    valid  case insensitive   someserver    invalid  someserver com    invalid john      invalid   somewhere com    invalid

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import java util Scanner   public class CheckingTheEmailPassword        public static void main String   args            String email   null          String password   null          Boolean password valid   false          Boolean email valid   false           Scanner input   new Scanner System in           do               System out println  Enter your email                  email   input nextLine                 System out println  Enter your passsword                  password   input nextLine                    checks for words numbers before  symbol and between     and                     Checks only 2 or 3 alphabets after                 if  email matches     w      w      a-zA-Z  2 3                     email valid   true              else                 email valid   false                  checks for NOT words numbers underscore and whitespace                 checks if special characters present             if   password matches        w  s        amp  amp                 checks alphabets present                      password matches     a-zA-Z        amp  amp                         checks numbers present                      password matches     0-9        amp  amp                         checks length                      password length    gt   8                   password valid   true              else                 password valid   false               if  password valid  amp  amp  email valid                  System out println   Welcome User                  else                   if   email valid                      System out println   Re-enter your email                      if   password valid                      System out println   Re-enter your password                               while   email valid     password valid            input close

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you can use a simple regular expression for validating email id    public boolean validateEmail String email     return Pattern matches    a-zA-Z1-9       A-Za-z0-9      A-Za-z0-9      A-Za-z0-9       A-Za-z0-9       email      Description       a-zA-Z1-9   - it will accept all A-Z a-z  0-9 and      mean it must be occur      A-Za-z0-9   - it s optional which will accept   and A-Z  a-z  0-9    mean its optional    A-Za-z0-9   -  it wil accept   and A-Z a-z 0-9    A-Za-z0-9   - its for   and A-Z a-z 0-9     A-Za-z0-9   - it occur    but its optional

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General Email format  RE  which include also domain like co in  co uk  com  outlook com etc   And rule says that      Uppercase and lowercase English letters  a-z  A-Z   Digits 0 to 9 Characters          amp        -                     Character    dot  period  full stop  provided that it is not the first or last character  and provided also that it does not appear two or more times consecutively    a-zA-Z0-9     a-zA-Z0-9     amp    -             a-zA-Z    a-zA-Z0-9  2 8   a-zA-Z   2 6

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I have tested this below regular expression for single and multiple consecutive dots in domain name -    A-Za-z0-9-      A-Za-z0-9-         A-Za-z0-9        and here are the examples which were completely fulfilled by above regex   End user live com End u exm-tech net enduser9876 gmail in end user mywebsite ac in gui Another984 User2 mail edu sg Another987 User5 mail show au Slow User example domain au in iamthemostsimpleremailhere example com   I have tried to cover maximum commonly used email id s validation by this above illustrated regex and yet working     If you still know some consequentially used email id s had left here  please let me know in comment section

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Modification of Armer B  answer which didn t validate emails ending with   co uk   public static boolean emailValidate String email        Matcher matcher   Pattern compile       w-       1 64      w amp  amp         2 255    a-z  2 3          Pattern CASE INSENSITIVE  matcher email        return matcher find

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One another simple alternative to validate 99  of emails  public static final String EMAIL VERIFICATION         w-       1 64      w amp  amp         2 255   a-z  2

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FWIW  here is the Java code we use to validate email addresses  The Regexp s are very similar   public static final Pattern VALID EMAIL ADDRESS REGEX        Pattern compile    A-Z0-9    -    A-Z0-9 -      A-Z  2 6     Pattern CASE INSENSITIVE    public static boolean validate String emailStr            Matcher matcher   VALID EMAIL ADDRESS REGEX matcher emailStr           return matcher find        Works fairly reliably

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You can use this method for validating email address in java   public class EmailValidator       private Pattern pattern      private Matcher matcher       private static final String EMAIL PATTERN                A-Za-z0-9-           A-Za-z0-9-                   A-Za-z0-9-       A-Za-z0-9         A-Za-z  2            public EmailValidator             pattern   Pattern compile EMAIL PATTERN                        Validate hex with regular expression               param hex                  hex for validation        return true valid hex  false invalid hex            public boolean validate final String hex         matcher   pattern matcher hex       return matcher matches

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Thanks to  Jason Buberel s answer  I think lowercase letters must be validated by the RegEX  So the following is correct    A-Za-z0-9    -    A-Za-z0-9 -     A-Za-z  2 6    Now  both developer961 mail com and DEV961 yahoo COM are valid  Note that    should be      to escape   and have    itself  Since    is a meaningful character in java RegEX means all characters

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If you want to allow non-latain characters  this one works quite well for me        p L   p N       -      p L   p N      -        p L   2       It does not allow IP s after the   but most valid email in the from of xxx xxx TDL could be validated with it   p L  validates UTF-Letters and  p N  validates UTF-Numbers  You can check this doc for more information

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Don t  You will never end up with a valid expression   For example these are all valid email addresses     Abc  def  example com  Fred Bloggs  example com  Joe  Blow  example com  Abc def  example com customer department shipping examp   le com  A12345 example com  def xyz abc example com  somename example com matteo this is a comment  corti example com root  127 0 0 1    Just to mention a few problems    you don t consider the many forms of specifying a host  e g  by the IP address  you miss valid characters you miss non ASCII domain names   Before even beginning check the corresponding RFCs

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Try the below code for email is format of   jsmith example com   1st part -jsmith      2nd part - example com  1  In the 1 part it will allow 0-9 A-Z dot sign    underscore sign     2  In the 2 part it will allow A-Z  must be   and      a-zA-Z0-9      a-zA-Z       a-zA-Z  2 3

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Is maching set to CASE INSENSITIVE

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