XPath Match and Wildcard support

Can wildcards be used to look for the presence of a substring? The following works:

<soap:Reason xmlns:soap="http://www.w3.org/2003/05/soap-envelope" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<soap:Text xml:lang="en">*</soap:Text>
</soap:Reason>

but this does not (even though the soap:Text element contains the substring 42001)

<soap:Reason xmlns:soap="http://www.w3.org/2003/05/soap-envelope" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<soap:Text xml:lang="en">*42001*</soap:Text>
</soap:Reason>