XML
<Galaxy>
<name>Milky Way</name>
<CelestialObject name="Earth" type="planet"/>
<CelestialObject name="Sun" type="star"/>
</Galaxy>
XPATH
/Galaxy/*[contains(lower-case(@name),'ear')]
or
//*[contains(lower-case(@name),'ear')]
or, with the string in double quotes:
//*[contains(lower-case(@name), "ear")]
OUTPUT
<CelestialObject name="Earth" type="planet" />