Validate only a specific email with regex in java

Question

I am trying to validate an email address. I currently 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,})$";

This will validate any email but I am trying to validate only a company specific email e.g.

myname@specificemail.com

The email will always end with .com but i would like the ability to change the company name at a later date with a different specific string e.g. @anotheremail.com, @somethingelse.com

Can anyone help with with the syntax?

Thanks

Not really duplicate if that regex validates the email addresses you want to accept, but please note that RFC-compliant email validation can be tricky, as answered in this question: [Using a regular expression to validate an email address](http://stackoverflow.com/questions/201323/using-a-regular-expression-to-validate-an-email-address) — Xavi López, Feb 11 '13 at 17:24
The main problem with the validation with a dynamic regular expression is that it always will be compiled over and over again. It is best to have a cache of already compiled patterns. — Paul Vargas, Feb 11 '13 at 17:47

score 2 · Accepted Answer · edited Jul 02 '17 at 16:32

2

You can validate company specific email using this regex:

private static final String coDomain = "specificemail.com";
private static final String EMAIL_PATTERN = 
    "^[_A-Za-z0-9-\\+]+(\\.[_A-Za-z0-9-]+)*@"
    + Pattern.quote(coDomain) + "$";

Later on just change the value of coDomain variable to some other name as needed.

edited Jul 02 '17 at 16:32

M. Witney

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answered Feb 11 '13 at 17:17

anubhava

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score 0 · Answer 2 · answered Feb 11 '13 at 17:17

0

// be careful with regex meta characters in the company name.
public static String emailFromCompanyPatternString(String company) {
    return "^[_A-Za-z0-9-\\+]+(\\.[_A-Za-z0-9-]+)*@"
    + company + (\\.[A-Za-z]{2,})$";
}

answered Feb 11 '13 at 17:17

jlordo

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score 0 · Answer 3 · answered Feb 11 '13 at 17:18

Perhaps something like this:

public static Pattern getEmailValidator( String domain ) {
    return Pattern.compile( "^[_A-Za-z0-9-\\+]+(\\.[_A-Za-z0-9-]+)*@" + domain );
}

public void someMethodThatNeedsToValidatEmail( String domain, String email ) {
    return getEmailValidator( domain ).matches( email );
}

Note, this is untested code...

score 0 · Answer 4 · answered Jan 19 '18 at 18:05

I am using this is for specific ending domain. Simply replace your ending domain with "@gmail.com"

private static final String EMAIL_REGEX1 = 
"^[a-zA-Z0-9_+&*-]+(?:\\.[a-zA-Z0-9_+&*-]+)*@gmail.com";

private static final String EMAIL_REGEX1 = 
"^[a-zA-Z0-9_+&*-]+(?:\\.[a-zA-Z0-9_+&*-]+)*@somethingelse.com";

Visit https://ideone.com/UUTnky for Full Regex Email Validation Java Implementation.

Validate only a specific email with regex in java

4 Answers4