Number of Valid Words in a Sentence LeetCode solution in Java

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class Solution {
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  public int countValidWords(String sentence) {
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    String regex = "^([a-z]+(-?[a-z]+)?)?(!|\\.|,)?$";
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    String r2 = "[^0-9]+";
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    String[] arr = sentence.split("\\s+");
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    int ans = 0;
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    for (String s : arr) {
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      if (s.matches(regex) && s.matches(r2)) {
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        ans++;
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        // System.out.println(s);
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      }
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    }
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    return ans;
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  }
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}