regex-match-group.js

/**
 * Given we have a regex with one more matching groups. 
 * The regex should capture those groups from an 'input' 
 * string and replace the matched values in an 'template' 
 * string. 
 * 
 * Example:
 * regex: /([1-9]{8})/([1-9]{8})?/
 * input string: '/some-magic/path/12122211/22112211'
 * template string: 'http://someurl?adId=$1&adId=$2'
 * 
 * Should produce following output: 
 * http://someurl?adId=12122211&adId=22112211
 * 
 * My current implementation, kinda works, but would love
 * to improve the string-template updater. 
 */

const re = new RegExp('/.*([1-9]{8})/([1-9]{8})?', 'g');
const input = '/some-magic/path/12122211/22112211';
const template = 'http://someurl?adId=$1&adId=$2';


console.log(input.replace(re, template));