PQ - Extract initial letters string from longer string with different length

Rawdata		Result
AD102201A		AD
AIRL		AIRL
AP0332010B		AP
ARILS78		ARILS
DD3403A1		DD
DAM001		DAM
POL321A		POL
WEIRD455555DDD123		WEIRD
ODD5QWERTY66ZXCVB9988		ODD
XYZ33WAB543ASD128SSD555		XYZ
ghost564tgb815		ghost

Code:

---

let
    Source = Excel.CurrentWorkbook(){[Name="Table1"]}[Content],
    Number = Table.AddColumn(Source, "FC", each Text.Select([Rawdata],{"0".."9"})),
    FC = Table.TransformColumns(Number, {{"FC", each Text.Start(_, 1), type text}}),
    Pos = Table.AddColumn(FC, "Pos", each Text.PositionOf([Rawdata], [FC])),
    Range = Table.AddColumn(Pos, "Text Range", each Text.Middle([Rawdata], 0, [Pos]), type text),
    IF = Table.AddColumn(Range, "Result", each if [Pos] = 0 then [Rawdata] else [Text Range]),
    TSC = Table.SelectColumns(IF,{"Result"})
in
    TSC

---

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