Extract values from a text, based on condition

[Danielnir]

Hi,

I have a dataset with item descriptions. Within those, there is information about volumes. How to extract just them? 

Sample photo showing how the description works:

As you can see, volume data can be placed randomly within the descriptions. Also, it can be "L" for litres instead of "ml" but it's optional to include in the solution. It might be a calculated column written in Dax if there's no other option.

May I ask for your assistance?

[Vijay_A_Verma]

Assuming the column name is Data, use below formula in a custom column

= List.Select(Text.Split([Data]," "),(x)=> try Value.Is(Number.From(Text.Split(Text.Replace(Text.Lower(x),"ml","l"),"l"){0}), type number) otherwise false and Text.Split(Text.Replace(Text.Lower(x),"ml","l"),"l"){1}=""){0}

See the working here - Open a blank query - Home - Advanced Editor - Remove everything from there and paste the below code to test

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45Wcs5JTcwrTlVwS0xOVQhPLM5QMDIwyM1R8A9yVYrViVbySMxLUXAuSk3MVTAFioPFggPcjA0UfPJLMvPzwKIKugpu/kEKvv4uYPlksHIjM3MfhZLyUrCQhamBr48CWEIpNhYA", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Data = _t]),
    #"Added Custom" = Table.AddColumn(Source, "Custom", each List.Select(Text.Split([Data]," "),(x)=> try Value.Is(Number.From(Text.Split(Text.Replace(Text.Lower(x),"ml","l"),"l"){0}), type number) otherwise false and Text.Split(Text.Replace(Text.Lower(x),"ml","l"),"l"){1}=""){0}, type text)
in
    #"Added Custom"

[AlexisOlson]

I'd recommend using List.First instead of {0} to avoid errors if the list is empty.

Here's a slightly simpler version:

List.First(
    List.Select(
        Text.Split([Data]," "), each
            try Value.Is(Number.From(Text.Remove(Text.Lower(_), {"m","l"})), type number)
            otherwise false
    )
)