Excel - Power Query TrimStart With condition - excel

Question

I want to trim 2 chars. if it’s Start with “20”
https://i.stack.imgur.com/MlmmE.png

Answer 1

You can test whether the text starts with "20", and if so, then return the text after "20":
if Text.StartsWith(Example, "20") then Text.AfterDelimiter(Example,"20") else Example
Edited answer:
A similar approach, but this step transforms values in a table column. Change Source and MyValue references to suit.
= Table.TransformColumns(Source, {{"MyValue", each Number.From(let x = Number.ToText(_) in if Text.Start(x,2) = "20" then Text.AfterDelimiter(x,"20") else x), type number}})

Answer 2

I started with a basic text file that looks like this ...
Example
20456 208899 123 366420
20324 535435 654 533454
852 929492 583 283832
... and for transparency and to show you how I got through it, all steps are outlined below. I suspect this could be done in a more efficient manner but it does the job.
Step 1
Step 2
Step 3
= Table.AddColumn(
#"Promoted Headers",
"Result",
each if Text.StartsWith([Example], "20") then Text.Middle([Example], 2) else [Example])
Step 4
Step 5 (Result)

Answer 3

Split your string by the space into a List.
Transform the list by checking each element to see if it starts with 20
eg: As an added column:
#"Added Custom" = Table.AddColumn(#"Changed Type", "Custom",
each
Text.Combine(
List.Transform(
Text.Split([Column1]," "),
each
if Text.StartsWith(_,"20")
then Text.Middle(_,2)
else _)," ")
)
Original and Results
Note:
If you don't want to add a column, you can transform the existing column with the same algorithm, but you need to use the Advanced Editor to enter the code:
trim20 = Table.TransformColumns(#"Previous Step", {"Column1", (c)=>
Text.Combine(
List.Transform(Text.Split(c," "),
each if Text.StartsWith(_,"20") then Text.Middle(_,2) else _)," ")})

Answer 4

If you're doing it on sheet directly, it's very straight forward.
=IF(LEFT(A1,2) = "20", MID(A1, 3, 1000), A1)