Add HTTP status formatting/parsing to ResultView

Added FormatHttpStatusInfo and ParseHttpStatusInfo methods to ResultView for converting between HttpStatusCode values and "statusCode statusName" strings. Included supporting Regex and necessary using directives.

src/ReC.Domain/Views/ResultView.cs

@@ -1,6 +1,8 @@
 using ReC.Domain.Constants;
 using System.ComponentModel.DataAnnotations;
 using System.ComponentModel.DataAnnotations.Schema;
+using System.Net;
+using System.Text.RegularExpressions;
 
 namespace ReC.Domain.Views;
 
@@ -62,4 +64,34 @@ public class ResultView
 
     [Column("CHANGED_WHEN")]
     public DateTime? ChangedWhen { get; set; }
+
+    private static readonly Regex HttpStatusInfoRegex = new(@"^(\d{3})\s+(.+)$", RegexOptions.Compiled);
+
+    /// <summary>
+    /// Formats an <see cref="HttpStatusCode"/> into a string in the form "statusCode statusName".
+    /// For example, <see cref="HttpStatusCode.NotFound"/> becomes "404 Not Found".
+    /// </summary>
+    public static string FormatHttpStatusInfo(HttpStatusCode statusCode)
+    {
+        var code = (int)statusCode;
+        var name = statusCode.ToString();
+        var displayName = Regex.Replace(name, "(?<!^)([A-Z])", " $1");
+        return $"{code} {displayName}";
+    }
+
+    /// <summary>
+    /// Parses an Info string in the form "statusCode statusName" back into its components.
+    /// Returns <c>null</c> if the string does not match the expected format.
+    /// </summary>
+    public static (int StatusCode, string StatusName)? ParseHttpStatusInfo(string? info)
+    {
+        if (info is null)
+            return null;
+
+        var match = HttpStatusInfoRegex.Match(info);
+        if (!match.Success)
+            return null;
+
+        return (int.Parse(match.Groups[1].Value), match.Groups[2].Value);
+    }
 }