New in version 1.5: The nl2br filter was added in Twig 1.5.
The nl2br filter inserts HTML line breaks before all newlines in a string:
{{ "I like Twig.\nYou will like it too."|nl2br }}
{# outputs
I like Twig.<br />
You will like it too.
#}
Note
The nl2br filter pre-escapes the input before applying the transformation.
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https://twig.sensiolabs.org/doc/1.x/filters/nl2br.html