Search for multiple keywords across table

CNENFRNL Cool. I didn't know how to use that 4th argument of List.PostitionOf.

Personally, I prefer not to use positional functions (except for first/last sort of thing) given how often I make indexing errors, so I'd probably do it more like this:

let
    KeywordList = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WSiwoyElVitWJVkrKLEoBM4pSIXRJUSpExis/Iw+qJBsoEgsA", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Keyword = _t]),
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("TYs7DoAgEAWv8kJtPIi1HaGAsAp+WLKg8fhup9UkM+9ZayZOBck3eAhFhLzTaNxgzZwIXYiQG1Zl+XTIEkG+66nW47df+MF2nbWBbxJ0VZFX7e4F", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Sentence = _t]),
    MatchList = Table.AddColumn(Source, "Matches", (r) => List.Select(KeywordList[Keyword], each Text.Contains(r[Sentence], _))),
    KeywordColumns =
        let MaxMatches = List.Max(List.Transform(MatchList[Matches], each List.Count(_)))
        in {"# keywords found"} & List.Transform({1..MaxMatches}, each "Keyword" & Number.ToText(_)),
    ToRecords = Table.TransformColumns(MatchList, {{"Matches", each let m = List.Count(_) in Record.FromList({m} & _, List.FirstN(KeywordColumns, m + 1)), type record}}),
    ExpandRecords = Table.ExpandRecordColumn(ToRecords, "Matches", KeywordColumns, KeywordColumns)
in
    ExpandRecords

Thanks for the solution in Power Query, but its really slow for my overall tables. Is this possible to do in DAX? I want to compare.