Java Utililty Methods Email Validate

Pattern reg = Pattern.compile("[\\w_]+@[\\w_]+\\.[A-Za-z]{2,4}");
Matcher exec = reg.matcher(mailAddr);
if (exec.find()) {
    return exec.group(0);
return mailAddr;

Pattern pattern = Pattern.compile("\\w+@(\\w+)(\\.\\w+){1,2}");
Matcher matcher = pattern.matcher(email);
String key = "unSupportEmail";
if (matcher.find()) {
    key = "smtp.port." + matcher.group(1);
if (hostMap.containsKey(key)) {
    return Integer.parseInt(hostMap.get(key));
...

if (isEmpty(email))
    return false;
return emailer.matcher(email).matches();

return email_Pattern.matcher(input).matches();

boolean isMatched = false;
String check = "^([a-z0-9A-Z]+[-|//.]?)+[a-z0-9A-Z]@([a-z0-9A-Z]+(-[a-z0-9A-Z]+)?//.)+[a-zA-Z]{2,}$";
isMatched = isMatched(email, check);
return isMatched;

final Matcher m = email.matcher(s);
return m.matches();

Matcher matcher = Pattern.compile(EMAIL_PATTERN).matcher(text);
return matcher.matches();

Pattern pat = null;
Matcher mat = null;
pat = Pattern.compile("^[\\w\\\\\\+]+(\\.[\\w\\\\]+)*@([A-Za-z0-9-]+\\.)+[A-Za-z]{2,4}$");
mat = pat.matcher(correo);
if (mat.find()) {
    return true;
} else {
    return false;
...

return isMatchRegex(data, REGEX_IS_EMAIL);

return p.matcher(email).matches();