Power Query - Trim after character

Hi,  aaron797 

Try code as below:

M query:

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMjC0MjbUMzIxMLU0U4rVAQsYmukZGRgYwLjGQFYsAA==", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Pace = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Pace", type text}}),
    #"Inserted Text Before Delimiter" = Table.AddColumn(#"Changed Type", "Number of Text Before Delimiter", each Text.PositionOf([Pace], ".",1), Int64.Type),
    #"Added Custom" = Table.AddColumn(#"Inserted Text Before Delimiter", "Length", each Text.Length([Pace])),
    #"Added Conditional Column" = Table.AddColumn(#"Added Custom", "Position of last character", each if [Number of Text Before Delimiter] = -1 then [Length] else if [Number of Text Before Delimiter] <> -1 then [Number of Text Before Delimiter]+4 else null),
    #"Added Custom1" = Table.AddColumn(#"Added Conditional Column", "Output", each Text.Middle([Pace],0,[Position of last character])),
    #"Removed Columns" = Table.RemoveColumns(#"Added Custom1",{"Number of Text Before Delimiter", "Length", "Position of last character"})
in
    #"Removed Columns"

Please check my sample file for more details.

Best Regards,
Community Support Team _ Eason