remove a string with {{ xxx }} inside another string

This is a stupid question but I would like to remove {{Lien web ....}} (including brakets) inside a string.

Example :

test {{Lien web|xyz}} test {{xyz}} test

Result should be :

test test {{xyz}} test

I tried with :

preg_replace('/\{\{.*?\}\}\s*/s','',$string);

but how to add "Lien web" ?

Thanks a lot!