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javaregexstringurlmailto

Java get email address from url

I have this url mailto:email@gmail.com?subject=... and I want to extract the email address.

I've done this:

String[] s = url.split("[:?]");

It works but I'm not happy with this solution.

Is there a way to do this using a regular expression or something better than what I have done?

Solution

  • You can try extracting only

    protocol:path?query
         ^^^^

    part with URL#getPath

    String email= new URL("mailto:email@gmail.com?subject").getPath();

System.out.println(email);

    Output: email@gmail.com

    But you can also simply use positions of first : and first ? after them to determine where should you cut the string.

    String data = "mailto:email@gmail.com?subject";
int colonIndex = data.indexOf(':')+1;
int questionMarkIndex = data.indexOf('?',colonIndex);
String email = null;
if (questionMarkIndex>colonIndex){
    email = data.substring(colonIndex,questionMarkIndex);
}else{//there was no `?` after `:`
    email = data.substring(colonIndex);
}
System.out.println(email);

    But actually I am not sure why you are "not happy" with split("[:?]"). It is perfectly fine and nice solution:

    String data = "mailto:email@gmail.com?subject";
String email = data.split("[:?]")[1];

System.out.println(email);

    which will also handle case where there is no ? at the end.