<st:Testprova id='abcd'>
  ....
</st>

  or

<st:Test1prova id='defg'>
  ....
</st>

"//*[contains(.,'prova')]/@ID"

Testprova
Prodprova
UATprova
provaTest

//*[matches(name(), '^Test[0-9]?prova$')]//@ID

//*[contains(name(),'prova')]/@id

<st:Testprova id='abcd'>
  ....
</st:Testprova>
<st:Test1prova id='defg'>
  ....
</st:Test1prova>