Text.Select Function in Power Query
The Text.Select function selects all occurrences of the given character or list of characters from the input text value.
Syntax
Example: Select all occurrence of the character in the given text.
Power Query M
let
    Source = Text.Select("Ashish Coder is the best website.", "e")
in
    Source   The output of the above code is “eeeee”.
Example: Select all occurrence of the given character in the given text.
Power Query M
let
    Source = Text.Select("Ashish Coder is the best website.", {"A", "i", "e"})
in
    Source   The output of the above code is “Aieieeeie”.
Example: Select all characters in the range of 'a' to 'z' from the text value.
Power Query M
let
    Source = Text.Select("Ashish Coder is the best website.", {"a".."z"})
in
    Source   The output of the above code is "shishoderisthebestwebsite".
Example: Select all characters in the range of small characters 'a' to 'z', Capital characters ‘A’ to ‘Z’, space “ ”, and a dot “.” from the text value.
Power Query M
let
    Source = Text.Select("Ashish Coder is the best website.", {"a".."z", "A".."Z", " ", "."})
in
    Source   The output of the above code is "Ashish Coder is the best website.".