字符串匹配功能将无法正常工作

Question

我有一个应该扫描字符串的函数，如果字符串包含诅咒字则返回true，否则返回false。

public static boolean isBad(String s) {
    //cussWords is a previously defined arraylist containing all possible spellings of all swear words (Loaded from a utf8 encoded file if that matters)
    s = s.replaceAll("[^A-Za-z0-9 ]", "").toLowerCase();
    String[] arr = s.split(" ");
    for (String str : arr) { //Break sentence into words and check each word
        str = str.trim();
        if (cussWords.contains(str)){ //Check if it is bad using ArrayList.contains function
            System.out.printf("\"%s\" contains a bad word.\n",s);
            return true;
        }
        if (badWords[hash(str)] != null) { //Check if it is bad using hash table

            System.out.printf("'%s' contains bad word: %s|%s\n", s, badWords[hash(str)], str);
            return true;
        }
    }
    System.out.printf("'%s' does not contain any bad words.\n", s);
    return false;
}

输入是硬编码的

System.out.println(cussWords.contains(*swear word*));

或

System.out.println(isBad(*sentence with swear word*));

输出正确，但在具有动态输入的服务器上运行时，该函数始终返回false。我花了几个小时独立地测试每个组件到这个功能，每个部分都独立工作，但是当它们放在一起时它们没有。我不知道代码是否可能已损坏，或者我错过了什么。

我在这里调用函数

        if (isCensored) {
        while (Dictionary.isBad(response)) {
            response = db.fetchResponse(db.all.get(r.nextInt(db.all.size()))); //db.all is an arraylist containing all possible responses stored in the database (It's a chat bot)
        }
    }

以下是问题的要点（在我的代码中，它没有被审查）

System.out.println(wordSet.contains("f***")); //Returns true

    for (String str : arr) {
        str = str.trim();
        System.out.println(str.equals("f***")); //Returns true
        if (wordSet.contains(str)){ //Returns false
            System.out.printf("\"%s\" contains a bad word.\n",s);
            return true;
        }
  }