--TEST--
Twig supports the "matches" operator with a great error message
--TEMPLATE--
{{ 'foo' matches 1 + 2 }}
--DATA--
return []
--EXCEPTION--
Twig\Error\RuntimeError: Regexp "3" passed to "matches" is not valid: Delimiter must not be alphanumeric%sbackslash%sin "index.twig" at line 2