how to add a string to string list

Question

    let IntAndString value = 
        let (|Match|_|) pattern input =
            let m = Regex.Match(input, pattern) in
            if m.Success then Some ([ for g in m.Groups -> g.Value ]) else None
        match value with
            | Match "(\d+)(\w+)" x -> x
            | Match "(\w+)" x -> x
            | Match "(\d+)" x -> x + "MY VALUE"
            | _ -> List.Empty

how can I add a string to my string list here ?

(\w+) also matches digits, so your third case will never match. You should swap the second and third cases. — Markus Jarderot
– Markus Jarderot, Commented Dec 27, 2010 at 12:12

cfern · Accepted Answer · 2010-12-27 10:41:45Z

2

You can append to a list with the @ operator. This operator concatenates two lists together, so you'll have to wrap the element you want to append in its own list like this:

| Match "(\d+)" x -> x @ ["MY VALUE"]

answered Dec 27, 2010 at 10:41

cfern

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Comments

Kevin Cantu · Accepted Answer · 2010-12-29 04:37:32Z

2

You could also use the list constructor, ::. If prepending instead of appending is OK:

| Match "(d\+)" x -> "MY VALUE" :: x

answered Dec 29, 2010 at 4:37

Kevin Cantu

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