Powershell rough and ready variable substitution

A very rough and ready way to transform a file based on an array of keys/values

  $example = @"  
   
  <servers>  
   <server name="AAA" value="{{valA}}" />  
   <server name="BBB" value="{{valB}}" />  
   <server name="CCC" value="{{valC}}" />  
 </servers>  
   
 "@  
   
   
 $configVals= @{ "valA"='blah1'; "valB"="whatever2";}  
   
   
 $configVals.GetEnumerator() | % {  
   $key = "{{"+$_.key+"}}"  
   $example = $example.Replace($key,$_.value)  
 }  
   
 Write-Host $example