识别句子中的回文

Question

我在这里找到的很多解决方案在检查字符串是否为回文后给出 true 或 false。我有一个检查字符串是否为回文的函数：

    function palindrome(myString){

    /* remove special characters, spaces and make lowercase*/
    var removeChar = myString.replace(/[^A-Z0-9]/ig, "").toLowerCase();

    /* reverse removeChar for comparison*/
    var checkPalindrome = removeChar.split('').reverse().join('');

    /* Check to see if myString is a Palindrome*/
    if(removeChar === checkPalindrome){

    document.write("<div>"+ myString + " is a Palindrome <div>");
    }else{

    document.write("<div>" + myString + " is not a Palindrome </div>");
    }
    }

    palindrome("Oh who was it I saw, oh who?")
    palindrome("Madam")
    palindrome("Star Wars")

但这不是我想要的。它只是检查字符串是否是回文。我想更新函数，使其 识别句子中的所有回文 而不是给它真或假。所以如果有这样一个句子 - "Madam and John went out at noon" 它会列出那个句子中的回文 - "Madam, noon"

如有任何帮助，我们将不胜感激！

Answer 1

function findPalindromes(str, min) {
  min = min || 3;
  var result = [];
  var reg = str.toLowerCase();
  var reg = reg.replace(/[^a-z]/g, ''); // remove if you want spaces
  var rev = reg.split("").reverse().join("");
  var l = reg.length;
  for (var i = 0; i < l; i++) {
    for (var j = i + min; j <= l; j++) {
      var regs = reg.substring(i, j);
      var revs = rev.substring(l - j, l - i);
      if (regs == revs) {
        result.push(regs);
      }
    }
  }
  return result;
}

var str1 = "Madam and John went out at noon";
console.log(str1, findPalindromes(str1));
var str2 = "\"Amore, Roma\" and \"There's no 'x' in Nixon\" are palindromes.";
console.log(str2, findPalindromes(str2));

Answer 2

function findPalindromes(sentence) {
  const words = sentence.replace(/[^\w\s]/gi, '').split(' ');
  const palindromes = words.filter(isPalindrome);
  return palindromes;
}

function isPalindrome(word) {
  if (word.length <= 0) return false;
  word = word.toLowerCase();
  for (let i = 0; i < word.length / 2; i++) {
    if (word[i] !== word[word.length - 1 - i]) return false;
  }
  return true;
}

https://jsfiddle.net/ewezbz22/1/

识别句子中的回文

Identify palindromes in a sentence

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palindrome