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

[sandy666]

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

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

https://www.youtube.com/channel/UCnxwq2aGJRbjOo_MO54oaHA
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https://www.reddit.com/r/windowsxp/comments/pexq9q/comment/k81ybvj/?utm_source=reddit&utm_medium=web2x&context=3
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ttps://www.youtube.com/watch?v=LP9fz2DCMBE
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ttps://www.youtube.com/watch?v=bFxnXH4-L1A
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https://www.youtube.com/channel/UCnxwq2aGJRbjOo_MO54oaHA