No problem.

It's not made clear, but it is on the MSDN page for CREATE INDEX http://msdn.microsoft.com/en-gb/library/ms188783(v=sql.105).aspx

The important lines are below, note in the filter_predicate part only AND is allowed, not OR.

You can see from the comparison_op list that LIKE isn't allowed either.

[ WHERE <filter_predicate> ]

...

<filter_predicate> ::=

<conjunct> [ AND <conjunct> ]

<conjunct> ::=

<disjunct> | <comparison>

<disjunct> ::=

column_name IN (constant ,...n)

<comparison> ::=

column_name <comparison_op> constant

<comparison_op> ::=

{ IS | IS NOT | = | <> | != | > | >= | !> | < | <= | !< }

Cheers