Try this:
Assign (String)
pattern = "Purchase\sDate.+?:\s+(?<purchase>[\d\/]+?)\s+In-service\sDate.+?:\s+(?<service>[\d\/]+?)"
Assign (Match)
match = System.Text.RegularExpressions.Regex.Match(MyVar, pattern)
Assign (String)
purchase = match.Groups("purchase").ToString
Assign (String)
service = match.Groups("service").ToString