Jeremy Frank jfrank-summit
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| {"valueParameterInfo":[],"slotParameterDescriptions":[],"roleDescriptions":[],"contractType":"O","contractShortDescription":"","contractName":"","contractLongDescription":"","choiceInfo":[]} |
jfrank-summit
/ Constrained.Types.fs
Last active
April 15, 2019 17:35
F# Signature File - Constrained Types
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| module StringConstraints | |
| open System | |
| let stringPattern str pattern = | |
| if String.IsNullOrEmpty(str) then | |
| let msg = sprintf "%s: Must not be null or empty" str | |
| Error msg | |
| elif System.Text.RegularExpressions.Regex.IsMatch(str, pattern) then | |
| Ok (str) | |
| else | |
| let msg = sprintf "'%s' must match the pattern '%s'" str pattern |