如何在 javascript 中的特定子字符串之后获取子字符串

Question

我正在制作一个自动回答琐事问题的机器人。我被困在这一点上。我有问题的字符串，我想将它从包含琐事的所有问题的字符串中分离出来。

在这个例子中，我有带有问题的字符串：

    var questions=`This was the first 3-D film*Bwana Devil
    This was the first cartoon talking picture*Steamboat Willie
    This was the sequel to "Star Wars"*The Empire Strikes Back`

我有一个变量

    var str="This was the first cartoon talking picture"

而且我需要在有问题的字符串中找到str的字符串，得到*后面的部分，所以

    "Steamboat Willie"

.

我真的不知道该怎么做。

Answer 1

for( int i =0; i < questions.lenght;i++)
{
    var string = questions.split("*")[i].substring(0,"\n");
}

这样的东西行得通吗？

Answer 2

假设您的字符串格式为在每个问题和答案对之间使用换行符：

1。按每个换行符拆分整个字符串：

var questionAnswerStringPairs = string.split('\n');

这将创建一组问题和答案字符串。每个答案将以“*”分隔。

2。映射结果数组，并创建匹配对象：

// This will store our data.
var questionAnswerPairs = {};

// Let's go through each string from step one and add the question and
// its answer to our object.
questionAnswerStringPairs.forEach( function(pair) {
  // split the string at the *
  pair = pair.split('*');

  // pair is now an array, the first element is the question string
  // the second element is the answer. Let's set those!
  var question = pair[0];
  var answer = pair[1];

  // now let's store that info in the object.
  questionAnswerPairs[question] = answer;
});

现在，您可以这样做： questionAnswerPairs['question i want the answer to']，或这样：questionAnswerPairs[stringObjectWithQuestion]，你会得到你的答案！

Answer 3

先拆分问题，再筛选，最后得出答案

var questions="This was the first 3-D film*Bwana Devil\nThis was the first cartoon talking picture*Steamboat Willie\nThis was the sequel to \"Star Wars\"*The Empire Strikes Back"
var str="This was the first cartoon talking picture"
    
var answers = questions
   .split("\n")
   .filter(question => question.indexOf(str) > -1)
   .map(question => question.substring(question.indexOf(str)+str.length+1))

alert(answers.join(","))

如何在 javascript 中的特定子字符串之后获取子字符串

How to get substring after specific substring in javascript

javascript

bots

1。按每个换行符拆分整个字符串：

2。映射结果数组，并创建匹配对象：