Java - Variable Check if Contains

Question

I think what I want to do is rather simple, but not sure. I'd like to do this in the easiest way as I have multiple different variables I want to apply this to. I want to search if a variable contains a certain word or words and then if it does set a new variable. For example if someone signs up for email and they have Gmail, I want to set a new variable for use later. I'm self taught and obviously new to java and would appreciate any feedback. Thanks.

if (email == "*@gmail.com") 
{
    var mailtype = "gmail"
};

Another example would be to verify email address format:

if (email == "*@*.*") 
{
    var mailformat = "okay"
};

What you are looking for is regualar expressions or short regex. — Jens, Jan 15 '15 at 17:54
`.equals()` is better than `==` and [here's why](http://stackoverflow.com/questions/513832/how-do-i-compare-strings-in-java). — meatspace, Jan 15 '15 at 17:56
thanks for the tips. I ended up using: if (emailinput.indexOf("gmail") !=-1) {var mailtype = "gmail"}; Is there any reason I shouldn't do it this way? Thanks for all the help. D. — DMatB, Jan 17 '15 at 14:33

score 1 · Answer 1 · answered Jan 15 '15 at 17:54

The simplest way, since you are just getting started, to do this is:

if( email.toLowerCase().endsWith("@gmail.com") ) {
  mailtype = "gmail";
}
else if( email.toLowerCase().endsWith("@yahoo.com") ) {
  mailtype = "yahoo";
}
else {
  mailtype = "okay";
}

But this being said, you will want to take a look at regular expressions and learn how to do this in a more solid and expandable way with matching groups.

Java - Variable Check if Contains

1 Answers1