How to retrieve all Variables from a Twig Template?

Question

Is it possible to retrieve all variables inside a Twig template with PHP?

Example someTemplate.twig.php:

Hello {{ name }}, 
your new email is {{ ema         


        

Answer 1

This Question has a douplicate – there I found a useful and kind of more powerfull RegEX than above. This one, I've improved to match more precise:

\{\{(?!%)\s* # Starts with {{ not followed by % followed by 0 or more spaces
  ((?:(?!\.)[^\s])*?) # Match anything without a point or space in it
  (\|(?:(?!\.)[^\s])*)? # Match filter within variable
\s*(?