Character to number

czuniga  would be happy with a PQ solution

let
   regex=let   fx=(input)=>
    Web.Page(
        "<script>
            var x='"&input&"';
            var b =(x.match(/\//gm)).length*5+(x.match(/x/gmi)).length*15;                                 document.write(b);
        </script>"){0}[Data]{0}[Children]{1}[Children]{0}[Text]

in
fx,
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45W0geCiIgIIKkUGwsA", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Column1 = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Column1", type text}}),
    #"Added Custom" = Table.AddColumn(#"Changed Type", "Custom", each regex([Column1])),
    #"Changed Type1" = Table.TransformColumnTypes(#"Added Custom",{{"Custom", Int64.Type}})
in
    #"Changed Type1"

https://community.powerbi.com/t5/Community-Blog/Using-JavaScript-in-power-query-for-regex-Part2/ba-p/2132960