What is the best way to extract a substring separated by two line breaks using a specific index?

Consider having the following string:

Apple Banana Pear
Pineapple Grapefruit Kiwi
Lime Lemon Cherry

If I am interested in extracting the line: 

Pineapple Grapefruit Kiwi

how can I achieve this by identifying any index within the second line and locating the newline character before and after that index?

I attempted the following approach:

fruits[0].slice(fruits[0].indexOf("\n"),fruits[0]
                       .indexOf("\n", fruits[0].indexOf("\n") + 1))

However, this method does not take advantage of the index but merely extracts the entire second line. It resembles a brute force strategy to isolate the second line.

javascriptarraysindexingnewline

Answer №1

To extract the second line of a string, you can either split the string by newlines and select the 2nd index:

const fruits = `Apple Banana Pear
Pineapple Grapefruit Kiwi
Lime Lemon Cherry`;
const [,secondLine] = fruits.split('\n');
console.log(secondLine);

Alternatively, you can directly match the substring between two newline characters without creating an intermediate array:

const fruits = `Apple Banana Pear
Pineapple Grapefruit Kiwi
Lime Lemon Cherry`;
console.log(fruits.match(/\n([^\n]+)\n/)[1]);

Answer №2

One way to tackle this issue is by utilizing the split() function in a straightforward manner.

function extractLineFromString(text, lineNum) {
      let lines = text.split('\n');
      return lines[lineNum];
}

Answer №3

String fruits = "Apple Banana Pear   
Pineapple Grapefruit Kiwi
Lime Lemon Cherry";
List<String> fruitList = fruits.split("\n");
fruitList.get(1);

The 'fruitList' now contains all the individual lines of fruits which can be accessed through their respective indexes.

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