Created
September 8, 2022 01:10
-
-
Save ncalm/68f8d403cde24e416a71fd82c7057df0 to your computer and use it in GitHub Desktop.
This Power Query function will apply a list of text substitutions to multiple columns in a table of dirty data
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
/* | |
Pass the names of tables in your Excel file to the first two parameters. | |
The substitutions table must have three columns: | |
1) column name | |
2) from text | |
3) to text | |
Exact column headers aren't important. | |
The delimiter should be some single-character delimeter that isn't present in the substitutions table. | |
For details: | |
https://www.youtube.com/watch?v=dIpa4nU9oIU | |
*/ | |
(dirty_table_name as text, substitutions_table_name as text, delimiter as text) => | |
let | |
//get the data from the two tables whose names were passed to the parameters | |
wb = Excel.CurrentWorkbook(), | |
dirty = wb{[Name=dirty_table_name]}[Content], | |
subs = wb{[Name=substitutions_table_name]}[Content], | |
//transform the substitutions table to a list of lists | |
subs_list = List.Transform( | |
Table.ToList(subs,Combiner.CombineTextByDelimiter(delimiter)), | |
each Text.Split(_,delimiter) | |
), | |
//iterate through the list of lists and apply the transformations | |
//to the appropriate columns | |
result = List.Accumulate( | |
subs_list, | |
dirty, | |
(a, b) => let | |
fn = (txt) => Text.Replace( txt , b{1} , b{2} ) | |
in Table.TransformColumns(a , { b{0} , fn }) | |
) | |
in | |
result |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment