Text Processing with JavaScript

Recipe 69

Matching Formatted Numbers with Thousand Separators

Task

Suppose you are developing a price comparison app to assist users in comparing product or service prices across various online retailers. Since prices often include thousand separators, you find yourself in need of a regex pattern that can accurately detect numbers with thousand separators.

So, if a website lists the product like this:

Great deal! $7,499 %20 Price drop

Your regex should be able to extract 7,499.

Solution

To extract numbers with thousand separators, you can use this function:

part_3/matching_thousand_separators/matching_thousand_separators_ex1.js

function extractNumbers(str) {
  const re = /\d{1,3}(?:,\d{3})*(?:\.\d+)?/g;
  return str.match(re)[0]; ...