How do I make it so a String is turned into only words with spaces in between each?

I saw some other people who solved this problem before but there are still some hiccups when it comes to turning it into a String, such as

yes, it is true

turning into

yes  it is true

I tried to solve this problem to the best of my ability. Could someone help me with this because I am trying to count all the words and it eventually considers "" (the space between the spaces) as a word. Please help!

What I have so far:

public String cleanToken(String token2){
        token2 = token2.replaceAll("'s", " ");
        token2 = token2.replaceAll("\\r|\\n", " ");
        token2 = token2.replaceAll("\\p{Punct}", " ");
        token2 = token2.replaceAll("   ", "");
        token2 = token2.replaceAll("  ", "");
        token2 = token2.replaceAll("\t", " ");
        token2 = token2.toLowerCase();
        return token2;
    }

Thanks in advance

\\s will match any whitespace. So, something like

return token2
        .replaceAll("'s", " ")
        .replaceAll("\\p{Punct}", " ")
        .replaceAll("\\s+", " ")
        .toLowerCase();

 StringUtils.normalizeSpace(s.replaceAll("\\W", ""));