Extract Email Address From Text Using Regular Expression in Java

I tried to extract email address from a random text using regular expression. But the extraction is not 100% accurate:( So I also provided a validation method to validate the extracted email address. It is also not very smart, only base on "@". I will try to improve it later.

    public String extractEmail(String content) {
        String email = null;
        String regex = "(\\w+)(\\.\\w+)*@(\\w+\\.)(\\w+)(\\.\\w+)*";
        Pattern pattern = Pattern.compile(regex);
        Matcher matcher = pattern.matcher(content);
        while (matcher.find()) {
            email = matcher.group();
            
            if(!isValidEmailAddress(email)){
                email=null;
            }

            break;
        }
        return email;
    }

    public boolean isValidEmailAddress(String emailAddress) {
        String expression = "^[\\w\\-]([\\.\\w])+[\\w]+@([\\w\\-]+\\.)+[A-Z]{2,4}$";
        CharSequence inputStr = emailAddress;
        Pattern pattern = Pattern.compile(expression, Pattern.CASE_INSENSITIVE);
        Matcher matcher = pattern.matcher(inputStr);
        return matcher.matches();

    }