another coding can
{.if|{.count substring|;%user%;|;user1;user2;user3;user4;user5;........userN;.}|
<a href="/page/">mylink</a>
.}
if you have a long list, it is best to use a group Admin
member of | A
true if the current user is member of group A (specify more than one group separating by semicolons ";").
Optional parameter user to check a different user.
Example member of|administrators|user=rejetto
{.if|{.member of |Admin.}|
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.}