[RegExp] Замена строки на последнюю подстроку

StringRegExpReplace($aFiles[$iFile], "(_REGISTRY_MACHINE_\.?)", "")

$file=FileRead(@ScriptDir&'\123')
$str=StringRegExpReplace($file,'.*(_\.?\S+)','\1')
MsgBox(0,'',$str)

StringRegExpReplace($aFiles[$iFile], "(_REGISTRY_[A-Z]*_\.?)", "")

StringRegExpReplace($text, "(_REGISTRY_(MACHINE|USER)_\.?)", "")

#Include<Array.au3>
$sText = "_REGISTRY_MACHINE_SAM"  & @CRLF & _ 
"_REGISTRY_MACHINE_SECURITY"  & @CRLF & _ 
"_REGISTRY_MACHINE_SOFTWARE"  & @CRLF & _ 
"_REGISTRY_MACHINE_SYSTEM"  & @CRLF & _ 
"_REGISTRY_USER_.DEFAULT"

$sPatern = "([^_\.]+?)(?:\R|\z)"
$aResult = StringRegExp( $sText, $sPatern, 3 )
_ArrayDisplay($aResult, ' Test Result ')