How to extract “parts” of a String according to some RegExp pattern?

Question

In JavaScript, given a regexp pattern and a string:

var pattern = \'/this/[0-9a-zA-Z]+/that/[0-9a-zA-Z]+\';
var str = \'/this/12/that/34\';

How

Answer 1

Use capture groups:

var res1 = '/this/12/that/34'.match(/\/this\/([0-9a-zA-Z]+)\/that\/([0-9a-zA-Z]+)/);

You will get an array containing 3 elements:

1. The whole match;

2. 12

3. 34

And you can use .slice(1) to remove the first element:

var res1 = '/this/12/that/34'.match(/\/this\/([0-9a-zA-Z]+)\/that\/([0-9a-zA-Z]+)/).slice(1);