Regex template for F#

regex.fs

open System.Text.RegularExpressions

// Seems to be a good capturing pattern, it's "Capture everything not in the list (that is ['?']) until the closing )
/* 

\(([^?]+)\)

*/

Regex.Matches (cref, "(([^?=&]+))") |> Seq.head |> fun mtch -> mtch.Value

// So output of Matches is Match seq (I think an array) and then you work on that.

let cref = "Android.Views.View.PerformHapticFeedback(Android.Views.FeedbackConstants, Android.Views.FeedbackFlags)"

Regex.Matches (cref, "\(([^?=&]+)\)") |> Seq.head |> fun mtch -> mtch.Groups.[1] |> fun capture -> capture.Value;;

val it : string =
  "Android.Views.FeedbackConstants, Android.Views.FeedbackFlags"
  
// Note the use of .Groups[1]! .Groups[0] is the match itself!