Extract Alphanumeric Value from String

Hi,

Create a custom column  as below

= let
Source = [String],
Pattern = List.First(List.Select(List.Transform({0..Text.Length(Source)-8}, each Text.Middle(Source, _, 8)), each Text.Length(_) = 8 and Text.Middle(_, 0, 2) = Text.Select(Text.Middle(_, 0, 2), {"a".."z"}) and Text.Middle(_, 2, 6) = Text.Select(Text.Middle(_, 2, 6), {"0".."9"})))
in
if Pattern = null then null else Pattern