Substring Count in Twig

Question

I am looking to use substr_count in Twig, does anything exist already? I want to perform something like this;

<?php
$text = 'This is a test';
echo strlen($text); // 14

echo substr_count($text, 'is'); // 2

I can do an extension but it seems this might be something built in already that I have missed.

Answer 1

How about this?

{%set count = text|split('is')|length-1 %}