Fun fact. A word is a single distinct element of speech or writing to form a sentence and typically shown with a space on either side. \w matches (any letter, number or underscore)
It is unclear to exactly what you are asking without a better explanation of what you are trying to accomplish.
If you want to match a word that contains letters and apostrophe ' with more than 3 characters..
List<String> words = new ArrayList<String>();
String s = "I want to have alot of money's when I am older.";
Pattern p = Pattern.compile("[a-zA-Z']{4,}");
Matcher m = p.matcher(s);
while (m.find()) {
words.add(m.group());
}
System.out.println(words);
// [want, have, alot, money's, when, older]
Note: This matches a word that contain's more than 3 characters, if you also want to match a word that contains 3 characters (foo) or more, you can use the following.
Pattern p = Pattern.compile("[a-zA-Z']{3,}");
