if string contains substring twig
Solutions
url() returns an array, as 4x4 says. You can see this if you do a for loop on the variable.
path(), however, seems to return a string that you can do your operation on. But it won't include hostname.
The twig function url() returns a render array, when you render it with the twig filter |render you get a markup object and when you render it again you get a string, which you can check whether it contains a substring:
{% set url = url('<current>') %}
{% if 'test' in url|render|render %}
<p>url contains "test"</p>
{% endif %}
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