Substring Count in Twig - count

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 %}

Answer 2

This doesn't exist in the list of Twig functions or filters.
You'll have to write your own custom function/filter or try a package (note; I've never used this package so can't comment on it, but was on the first page of Google results).

Answer 3

I went for an extension
namespace AppBundle\Twig;
class SubStrCountExtension extends \Twig_Extension
{
public function getFunctions()
{
return array(
new \Twig_SimpleFunction('substr_count', array($this, 'substr_count')),
);
}
public function getName()
{
return 'substr_count_extension';
}
public function substr_count($str, $char)
{
return substr_count($str, $char);
}
}
And in services.yml
app.twig_extension.substr_count_extension:
class: AppBundle\Twig\SubStrCountExtension
tags:
- { name: twig.extension }

Answer 4

I use solution in Symfony 3.2.8 but in the description does not say this block of code should is inside : services
If you does not make show this error:
There is no extension able to load the configuration for .....
This code should is inside services this is correct:
services:
app.twig_extension.substr_count_extension:
class: AppBundle\Twig\SubStrCountExtension
tags:
- { name: twig.extension }
Finally, the correct use in twig is:
tu placa es: {{substr_count(datos.picoyplaca,4)}}
Regards