LuaScript: use invariant regex on parameter parsing (fixes #2350) (#2351)

This changes the regex to use `RegexOptions.CultureInvariant` and adds an easy way to do tests like this in the future with `[Fact, TestCulture("tr-TR")]` for example, which will set and restore the culture for a specific test.

Before/after break/fix test included for the Turkish case.

Author: NickCraver

docs/ReleaseNotes.md

@@ -8,7 +8,7 @@ Current package versions:
 
 ## Unreleased
 
-No pending changes for the next release yet.
+- Fix [#2350](https://github.com/StackExchange/StackExchange.Redis/issues/2350): Properly parse lua script paramters in all cultures ([#2351 by NickCraver](https://github.com/StackExchange/StackExchange.Redis/pull/2351))
 
 ## 2.6.90
 

src/StackExchange.Redis/ScriptParameterMapper.cs

@@ -24,7 +24,7 @@ public ScriptParameters(RedisKey[] keys, RedisValue[] args)
             }
         }
 
-        private static readonly Regex ParameterExtractor = new Regex(@"@(?<paramName> ([a-z]|_) ([a-z]|_|\d)*)", RegexOptions.Compiled | RegexOptions.IgnoreCase | RegexOptions.IgnorePatternWhitespace);
+        private static readonly Regex ParameterExtractor = new Regex(@"@(?<paramName> ([a-z]|_) ([a-z]|_|\d)*)", RegexOptions.Compiled | RegexOptions.IgnoreCase | RegexOptions.IgnorePatternWhitespace | RegexOptions.CultureInvariant);
 
         private static string[] ExtractParameters(string script)
         {

tests/StackExchange.Redis.Tests/Helpers/Attributes.cs

@@ -1,6 +1,8 @@
 using System;
 using System.Collections.Generic;
+using System.Globalization;
 using System.Linq;
+using System.Reflection;
 using System.Threading;
 using System.Threading.Tasks;
 using Xunit.Abstractions;
@@ -184,3 +186,48 @@ public static RunSummary Update(this RunSummary summary, SkippableMessageBus bus
         return summary;
     }
 }
+
+/// <summary>
+/// Supports changing culture for the duration of a single test.
+/// <see cref="Thread.CurrentThread" /> and <see cref="CultureInfo.CurrentCulture" /> with another culture.
+/// </summary>
+/// <remarks>
+/// Based on: https://bartwullems.blogspot.com/2022/03/xunit-change-culture-during-your-test.html
+/// </remarks>
+[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, AllowMultiple = false, Inherited = true)]
+public class TestCultureAttribute : BeforeAfterTestAttribute
+{
+    private readonly CultureInfo culture;
+    private CultureInfo? originalCulture;
+
+    /// <summary>
+    /// Replaces the culture and UI culture of the current thread with <paramref name="culture" />.
+    /// </summary>
+    /// <param name="culture">The name of the culture.</param>
+    public TestCultureAttribute(string culture) => this.culture = new CultureInfo(culture, false);
+
+    /// <summary>
+    /// Stores the current <see cref="Thread.CurrentPrincipal" /> and <see cref="CultureInfo.CurrentCulture" />
+    /// and replaces them with the new cultures defined in the constructor.
+    /// </summary>
+    /// <param name="methodUnderTest">The method under test</param>
+    public override void Before(MethodInfo methodUnderTest)
+    {
+        originalCulture = Thread.CurrentThread.CurrentCulture;
+        Thread.CurrentThread.CurrentCulture = culture;
+        CultureInfo.CurrentCulture.ClearCachedData();
+    }
+
+    /// <summary>
+    /// Restores the original <see cref="CultureInfo.CurrentCulture" /> to <see cref="Thread.CurrentPrincipal" />.
+    /// </summary>
+    /// <param name="methodUnderTest">The method under test</param>
+    public override void After(MethodInfo methodUnderTest)
+    {
+        if (originalCulture is not null)
+        {
+            Thread.CurrentThread.CurrentCulture = originalCulture;
+            CultureInfo.CurrentCulture.ClearCachedData();
+        }
+    }
+}

tests/StackExchange.Redis.Tests/ScriptingTests.cs

@@ -1113,6 +1113,29 @@ public async Task TestEvalShaReadOnlyAsync()
         Assert.Equal("bar", result.ToString());
     }
 
+    [Fact, TestCulture("en-US")]
+    public void LuaScriptEnglishParameters() => LuaScriptParameterShared();
+
+    [Fact, TestCulture("tr-TR")]
+    public void LuaScriptTurkishParameters() => LuaScriptParameterShared();
+
+    private void LuaScriptParameterShared()
+    {
+        const string Script = "redis.call('set', @key, @testIId)";
+        var prepared = LuaScript.Prepare(Script);
+        var key = Me();
+        var p = new { key = (RedisKey)key, testIId = "hello" };
+
+        prepared.ExtractParameters(p, null, out RedisKey[]? keys, out RedisValue[]? args);
+        Assert.NotNull(keys);
+        Assert.Single(keys);
+        Assert.Equal(key, keys[0]);
+        Assert.NotNull(args);
+        Assert.Equal(2, args.Length);
+        Assert.Equal(key, args[0]);
+        Assert.Equal("hello", args[1]);
+    }
+
     private static void TestNullValue(RedisResult? value)
     {
         Assert.True(value == null || value.IsNull);