JavaScript string: Use regex to find and replace with position index

I'm not very familiar with regex, so I'm curious about the process of replacing a section in a string based on a regex pattern where the index is part of the identified section.

Let's consider this example string:

let exampleStr = "How do I {0} the {n} with the {1} in my array?";

And here is my data array:

let arr = ["replace", "items"];

Using replace and regex, I aim to match the index in the {#} section with the corresponding element from the array.

The resulting string should be:

let result = "How do I replace the {n} with the items in my array?";

You may notice that the {n} is ignored since it doesn't contain a numeric value.

Although I can achieve this using Array.indexOf, Number.isNaN, typeof, etc., regex seems like a more elegant and efficient approach, even though it may be a bit trickier to comprehend :)

Thank you for your help!

Answer №1

To implement this functionality, consider utilizing the replace method with a callback function:

let sampleString = "What is the {0} of the {n} in the {1}?";
let myArray = ["value", "objects"];

let output = sampleString.replace(/\{(\d+)\}/g, (group0, group1) => myArray[parseInt(group1, 10)]);
console.log(output);

The regular expression pattern searches for numbers within curly braces, capturing them as group number 1.
The callback function then converts and retrieves the corresponding element from the array, improving readability compared to using arr["1"].
Adding more robust error handling to the callback function would be beneficial.

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