如何通过使用Java中的split从字符串中获取多个电子邮件的列表？

Question

I have this string that contains a bunch of emails in it:

" email1@gmail.com , 'email2@gmail.com,email3@gmail.com, email4@gmail.com' , 'email5@gmail.com ,email6@gmail.com' "

So what I'm trying to do is extract each email from each substring and end up with an array that contains all those email:

Example:

String[] myArray = {email1@gmail.com , email2@gmail.com, email3@gmail.com, email4@gmail.com, email5@gmail.com};

Here's my code:

String str = "email1@gmail.com , 'email2@gmail.com,email3@gmail.com, email4@gmail.com' , 'email5@gmail.com ,email6@gmail.com'";

    String[] newArray = str.split(",");
     for(int i = 0 ; i < newArray.length; i++) 
        {
        if(newArray[i].contains(",")) 
         {
            newArray = newArray[i].split(",");
         }
        }

Keep in mind that a subString may have multiple emails in it.

Answer 1

You can use Pattern matching and regex, a simple email follows : \\w+@\\w+.com : multipleWordCharacter@multipleWordCharacter.com

public static void main(String[] args) {
    String str = "email1@gmail.com,'email2@gmail.com,email3@gmail.com, email4@gmail.com'" +
            ", 'email5@gmail.com ,email6@gmail.com'";

    Matcher m = Pattern.compile("\\w+@\\w+.com").matcher(str);
    List<String> emailsList = new ArrayList<>();

    while (m.find()){
        emailsList.add(m.group());
    }

    String[]emailsArray = emailsList.toArray(new String[0]);  // if really need an array
    System.out.println(Arrays.toString(emailsArray));
}

I used a List at first because it's very easy to add element dunamiclly, you can't with an array, but at the, end you still can use an array with the code I wrote

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And this will print :

[email1@gmail.com, email2@gmail.com, email3@gmail.com, email4@gmail.com, email5@gmail.com, email6@gmail.com]

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Regex demo & Code demo

Answer 2

Why don't you just do?:

String noQuotesStr = str.replace("'", ""); //removes '
String[] newArray = noQuotesStr.split(",");