How to match specific character after another specific character

I need to find a specific character after another specific character. For example

jhony@domain.com

I need to find the first occurrence of "." until the end of word after the first occurrence of "@"

I tried this pattern but I was not successful:

(?<=@)([.])$

https://regex101.com/r/sTRpxp/1

Alternative regex:

"(?<=@\\w{1,100})(\\.\\S+)"

Regex in context and testbench:

public static void main(String[] args) {
    String input = "jhony@domain.com";

    Pattern pattern = Pattern.compile("(?<=@\\w{1,100})(\\.\\S+)");
    Matcher matcher = pattern.matcher(input);
    if(matcher.find()) {
        System.out.println(matcher.group(1));
    }
}

Matching without "group number":

public static void main(String[] args) {
    String input = "jhony@domain.com";

    Pattern pattern = Pattern.compile("(?<=@\\w{1,100})\\.\\S+");
    Matcher matcher = pattern.matcher(input);
    if(matcher.find()) {
        System.out.println(matcher.group());
    }
}

Output:

.com

More about Pattern's 'Special constructs' can be found here: https://docs.oracle.com/javase/10/docs/api/java/util/regex/Pattern.html