java - 回文忽略空格和标点符号

Question

 public static void main(String[] args) 
{
    Scanner sentence = new Scanner(System.in);
    System.out.println("This program will determine if an inputted phrase is a palindrome.");
    System.out.println(" ");
    System.out.println("Enter a phrase, word, or sentence:");
    String a = sentence.nextLine();
    String b = a.toLowerCase().replaceAll("[^a-z]"," "); //as long as the words are spelt the same way, the caps don't matter and it ignores spaces and punctuation
    System.out.println();
    System.out.println(palindromeChecker(b)); //calls method

}

public static String palindromeChecker(String b) 
{
    String reverse = new StringBuilder(b).reverse().toString();
    String c; 
    if(b.equals(reverse)) { 
        c = "The word " +b+ "  is a palindrome"; }
    else {
        c = "The word " +b+ "  is not a palindrome"; }
    return c;

}

}

我的问题是，例如，如果我做伊娃，我可以看到洞穴里的蜜蜂吗？它应该是一个回文，但它不是，你可以帮我解决这个问题，请尽量不要让它变得复杂。

Answer 1

替换:

String b = a.toLowerCase().replaceAll("[^a-z]"," ");

与

String b = a.toLowerCase().replaceAll("[^a-z]","");

否则，您将用空格替换非字母字符，这可能会影响反向字符串的检查。