Twig / PHP - Format string using Replace or Regex

Question

How can I format a string in Twig as follows:

For example: img = 05myphoto-Car.jpg

I need to remove the numeric prefix and -

Answer 1

Better late than never...

Just register it (for me was on index.php)

$app['twig']->addFilter('preg_replace', new Twig_Filter_Function(function ($subject, $pattern, $replacement) {
    return preg_replace($pattern, $replacement, $subject);
}));

Then on the view: {{myVar|preg_replace('/\\d+/','')}}

Notice that all backslashes MUST be escaped, if not, they will be removed by Twig...