XSD element name pattern matching

I'm trying to make an XSD to validate some XML I'm getting back from a web service. It looks something like this:

<values>
    <value_1>asdf</value_1>
    <value_2>asdf</value_2>
    <value_3>asdf</value_3>
    <value_4>asdf</value_4>
    <value_5>asdf</value_5>
</values>

The number of inner value nodes is unbounded, but they always end with the _ + number suffix. Is it possible to to write an XSD that validates the node names themselves?