Number of Different Integers in a String LeetCode solution in Java

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class Solution {
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  public int numDifferentIntegers(String word) {
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    String[] arr = word.replaceAll("[a-zA-Z]", " ").split("\\s+");
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    Set<String> set = new HashSet<String>();
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    for (String str : arr) {
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      if (!str.isEmpty()) set.add(String.valueOf(str.replaceAll("^0*", "")));
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    }
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    return set.size();
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  }
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}