fix duplicate semver regex

src/SMAPI.Common/SemanticVersionImpl.cs

@@ -8,20 +8,6 @@ namespace StardewModdingAPI.Common
     /// <remarks>The implementation is defined by Semantic Version 2.0 (http://semver.org/).</remarks>
     internal class SemanticVersionImpl
     {
-        /*********
-        ** Properties
-        *********/
-        /// <summary>A regular expression matching a semantic version string.</summary>
-        /// <remarks>
-        /// This pattern is derived from the BNF documentation in the <a href="https://github.com/mojombo/semver">semver repo</a>,
-        /// with three important deviations intended to support Stardew Valley mod conventions:
-        /// - allows short-form "x.y" versions;
-        /// - allows hyphens in prerelease tags as synonyms for dots (like "-unofficial-update.3");
-        /// - doesn't allow '+build' suffixes.
-        /// </remarks>
-        private static readonly Regex Regex = new Regex(@"^(?>(?<major>0|[1-9]\d*))\.(?>(?<minor>0|[1-9]\d*))(?>(?:\.(?<patch>0|[1-9]\d*))?)(?:-(?<prerelease>(?>[a-z0-9]+[\-\.]?)+))?$", RegexOptions.CultureInvariant | RegexOptions.IgnoreCase | RegexOptions.Compiled | RegexOptions.ExplicitCapture);
-
-
         /*********
         ** Accessors
         *********/
@@ -37,6 +23,15 @@ namespace StardewModdingAPI.Common
         /// <summary>An optional prerelease tag.</summary>
         public string Tag { get; }
 
+        /// <summary>A regular expression matching a semantic version string.</summary>
+        /// <remarks>
+        /// This pattern is derived from the BNF documentation in the <a href="https://github.com/mojombo/semver">semver repo</a>,
+        /// with three important deviations intended to support Stardew Valley mod conventions:
+        /// - allows short-form "x.y" versions;
+        /// - allows hyphens in prerelease tags as synonyms for dots (like "-unofficial-update.3");
+        /// - doesn't allow '+build' suffixes.
+        /// </remarks>
+        internal static readonly Regex Regex = new Regex(@"^(?>(?<major>0|[1-9]\d*))\.(?>(?<minor>0|[1-9]\d*))(?>(?:\.(?<patch>0|[1-9]\d*))?)(?:-(?<prerelease>(?>[a-z0-9]+[\-\.]?)+))?$", RegexOptions.CultureInvariant | RegexOptions.IgnoreCase | RegexOptions.Compiled | RegexOptions.ExplicitCapture);
 
         /*********
         ** Public methods

src/SMAPI.Web/Framework/VersionConstraint.cs

@@ -1,4 +1,5 @@
 using Microsoft.AspNetCore.Routing.Constraints;
+using StardewModdingAPI.Common;
 
 namespace StardewModdingAPI.Web.Framework
 {
@@ -10,6 +11,6 @@ namespace StardewModdingAPI.Web.Framework
         *********/
         /// <summary>Construct an instance.</summary>
         public VersionConstraint()
-            : base(@"^v(?>(?<major>0|[1-9]\d*))\.(?>(?<minor>0|[1-9]\d*))(?>(?:\.(?<patch>0|[1-9]\d*))?)(?:-(?<prerelease>(?>[a-z0-9]+[\-\.]?)+))?$") { }
+            : base(SemanticVersionImpl.Regex) { }
     }
 }