Help with StringRegExp

I'm trying to find the last decimal number from a text file.  Problem is that the array that is returned will return multiple values, but only from the first line in which they occur, not from additional lines in the file.

$tmpTxt = "tmptxt.txt"
$aFile = FileOpen($tmpTxt)
$file = FileRead($aFile)
$regex = StringRegExp($file,'([0-9]{1,5}\.[0-9]{2})(.*)', 1)

Thanks for any help you can provide.