CODEWITHSUNDEEP
javaregexspringvalidationemail
w3Charlie
w3Charlie

Reputation: 133

spring validation java pattern multiple mail

I have problems with the regex. somehow the online regextester does not work with the pattern.

I would like to allow

[email protected]

and

[email protected];[email protected];[email protected]

so one without semicolon and multiple with semicolon between, but not on the end

what I have: 

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);
}

public boolean valid(final String email) {

    matcher = pattern.matcher(email);
    return matcher.matches();

}

Upvotes: 1

Views: 1408

Answers (2)

Alien
Alien

Reputation: 426

See if this one works for you:

@Test
public void testValidEmail(){
        String regex =
                    "(([A-Za-z0-9_\\-\\.])+\\@([A-Za-z0-9_\\-\\.])+\\.([A-Za-z]{2,4}))(((;|,|; | ;| ; | , | ,){1}"
                    +"([A-Za-z0-9_\\-\\.])+\\@([A-Za-z0-9_\\-\\.])+\\.([A-Za-z]{2,4}))*)";
        Boolean matches = Pattern.matches(regex, "[email protected];[email protected];[email protected]");
        Assert.assertTrue(matches); 
}

Upvotes: 1

Wiktor Stribiżew
Wiktor Stribiżew

Reputation: 627327

Just take the pattern in between the anchors as the single email matching subpattern, and use it to build the final pattern:

private static final String SINGLE_EMAIL_PATTERN = "[_A-Za-z0-9-+]+(\\.[_A-Za-z0-9-]+)*@"
    + "[A-Za-z0-9-]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})";
private static final String EMAIL_PATTERN = "^" + SINGLE_EMAIL_PATTERN + "(?:;" + SINGLE_EMAIL_PATTERN + ")*$";

Your pattern will look like the one here.

  • ^ - will assert the start of string
  • SINGLE_EMAIL_PATTERN - will match 1 email
  • (?:;<SINGLE_EMAIL_PATTERN>)* - will match 0 or more sequences of:
    • ; - a ;
    • <SINGLE_EMAIL_PATTERN> - a single email
  • $ - will assert the end of string.

Upvotes: 1

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