New in version 1.32: The side argument was added in Twig 1.32.
New in version 1.6.2: The trim filter was added in Twig 1.6.2.
The trim filter strips whitespace (or other characters) from the beginning and end of a string:
{{ ' I like Twig. '|trim }}
{# outputs 'I like Twig.' #}
{{ ' I like Twig.'|trim('.') }}
{# outputs ' I like Twig' #}
{{ ' I like Twig. '|trim(side='left') }}
{# outputs 'I like Twig. ' #}
{{ ' I like Twig. '|trim(' ', 'right') }}
{# outputs ' I like Twig.' #}
character_mask: The characters to stripside: The default is to strip from the left and the right (both) sides, but left and right will strip from either the left side or right side only
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https://twig.sensiolabs.org/doc/1.x/filters/trim.html