Standardize Phone Numbers in Power Query M

Strips formatting from phone numbers and reformats the digits into a consistent (XXX) XXX-XXXX pattern.

Text TransformationsIntermediatephoneformatstandardizetext

Power Query M code

let
    Source = YourTable,
    Formatted = Table.TransformColumns(Source, {{"Phone", each
        let
            Digits = Text.Select(_, {"0".."9"}),
            LastTen = Text.End(Digits, 10)
        in
            "(" & Text.Start(LastTen, 3) & ") " & Text.Middle(LastTen, 3, 3) & "-" & Text.End(LastTen, 4), type text}})
in
    Formatted

Notes

Assumes 10-digit North American numbers; adjust the format string for other countries.

Requirements

How to use this snippet

  1. In Power BI Desktop, choose Transform data to open Power Query, then open the Advanced Editor on a query (or start from a blank query).
  2. Paste the snippet and replace the placeholder names (tables, columns, file paths) with your own. Check the requirements above first.
  3. Run it through the Power Query M Formatter to tidy the layout.

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