Question 210321 in Javascript Question posted in
A very good W3school tutorial can be found here.

How to get specific text from a string using javascript?

Lets say I have a string with the value "this-is-the-whole-string-value-33297af405e6". I want to extract the last number part from this string. The result I’m looking for is only "33297af405e6". How can I get this value?

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2

Answers


  1. 0

    For the best performance nothing is faster than searching a string. It could be critical if you process a big JSON data. It’s more than 3x faster that splitting the string:

    const str = 'this-is-the-whole-string-value-33297af405e6';
const found = str.substring(str.lastIndexOf('-') + 1);

console.log(found);

    And benchmarking different solutions:

    enter image description here

    <script benchmark data-count="10000000">

const str = "this-is-the-whole-string-value-33297af405e6";

// @benchmark split + pop

str.split('-').pop();

// @benchmark split + at

str.split('-').pop();

// @benchmark regex

str.match(/[^-]+$/)[0]

// @benchmark lastIndexOf

str.substring(str.lastIndexOf('-') + 1);

</script>
<script src="https://cdn.jsdelivr.net/gh/silentmantra/benchmark/loader.js"></script>
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  2. 0

    split() on -, and get the last part by calling pop() on the array:

    const input = "this-is-the-whole-string-value-33297af405e6";

const output = input.split('-').pop();

console.log(output); // 33297af405e6
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