Regular expression which accepts multiple email addresses seperated by comma in java

Question

In my project I give email address to send the mail in a text box. I can give either a single email address or a multiple email address separated by commas. Is there any regular expression for this situation. I used the following code and its check for single email address only.

public static boolean isEmailValid(String email){  

            boolean isValid = false;  
        String expression = "^[\\w\\.-]+@([\\w\\-]+\\.)+[A-Z]{2,4}$";  
        CharSequence inputStr = email;  

        Pattern pattern = Pattern.compile(expression,Pattern.CASE_INSENSITIVE);  
        Matcher matcher = pattern.matcher(inputStr);  
        if(matcher.matches()){  
        isValid = true;  
        }  
        return isValid;  
        }

I may be daft, but just split by comma and parse each token? Given a comma isn't a valid email character, you should only be able to have valid values between. (You may also want to trim the tokens before parsing to avoid white space failures). — Brad Christie, Sep 22 '11 at 14:26
It should also be noted that [regex is not a very good way to validate an email address](http://stackoverflow.com/questions/201323/what-is-the-best-regular-expression-for-validating-email-addresses/201378#201378). — unholysampler, Sep 22 '11 at 14:30
I hope you are aware that your regex is very simple and will miss a lot of valid email addresses, because you don't allow valid characters to be part of the email address. — stema, Sep 22 '11 at 14:42
In addition to what **stema** and **unholysampler** said, this regex will block top-level domains longer than 4 characters, which do exist. [.museum](http://www.smithsonian.museum/) and [.travel](http://www.travel.travel/), for example, or [internationalized country-code TLDs](http://en.wikipedia.org/wiki/Internationalized_country_code_top-level_domain) such as [.δοκιμή](http://παράδειγμα.δοκιμή). — Justin Morgan - On strike, Sep 22 '11 at 15:51

score 1 · Answer 1 · answered Sep 22 '11 at 14:27

1

Split the input by a delimiter in your case ','.
Check each email if its a valid format.
Show appropriate message (email 1 is valid , email 2 is not valid , email 3 is not valid etc etc)

answered Sep 22 '11 at 14:27

David

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score 0 · Accepted Answer · answered Sep 22 '11 at 14:25

0

You can split your email-var on a ",", and check for each emailaddress you got :)

answered Sep 22 '11 at 14:25

Snicksie

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Regular expression which accepts multiple email addresses seperated by comma in java

2 Answers2