Use RegexOptions.Compiled if it is supported.

StackExchange.Redis/StackExchange.Redis.StrongName.csproj

@@ -89,6 +89,7 @@
     <Compile Include="StackExchange\Redis\HashEntry.cs" />
     <Compile Include="StackExchange\Redis\IConnectionMultiplexer.cs" />
     <Compile Include="StackExchange\Redis\InternalErrorEventArgs.cs" />
+    <Compile Include="StackExchange\Redis\InternalRegexCompiledOption.cs" />
     <Compile Include="StackExchange\Redis\IProfiler.cs" />
     <Compile Include="StackExchange\Redis\MigrateOptions.cs" />
     <Compile Include="StackExchange\Redis\ProfileContextTracker.cs" />

StackExchange.Redis/StackExchange.Redis.csproj

@@ -83,6 +83,7 @@
     <Compile Include="StackExchange\Redis\HashEntry.cs" />
     <Compile Include="StackExchange\Redis\IConnectionMultiplexer.cs" />
     <Compile Include="StackExchange\Redis\InternalErrorEventArgs.cs" />
+    <Compile Include="StackExchange\Redis\InternalRegexCompiledOption.cs" />
     <Compile Include="StackExchange\Redis\IProfiler.cs" />
     <Compile Include="StackExchange\Redis\MigrateOptions.cs" />
     <Compile Include="StackExchange\Redis\ProfileContextTracker.cs" />

StackExchange.Redis/StackExchange/Redis/InternalRegexCompiledOption.cs

+#if NETCORE
+using System;
+#endif
+using System.Text.RegularExpressions;
+
+namespace StackExchange.Redis
+{
+    internal static class InternalRegexCompiledOption
+    {
+        private static readonly RegexOptions RegexCompiledOption;
+
+        static InternalRegexCompiledOption()
+        {
+#if NETCORE
+            if (!Enum.TryParse("Compiled", out RegexCompiledOption))
+                RegexCompiledOption = RegexOptions.None;
+#else
+            RegexCompiledOption = RegexOptions.Compiled;
+#endif
+        }
+
+        /// <summary>
+        /// Gets the default <see cref="RegexOptions"/> to use.
+        /// <see cref="System.Text.RegularExpressions.RegexOptions.Compiled"/> option isn't available yet for dnxcore50.
+        /// This returns <see cref="System.Text.RegularExpressions.RegexOptions.Compiled"/> if it is supported; 
+        /// <see cref="System.Text.RegularExpressions.RegexOptions.None"/> otherwise.
+        /// </summary>
+        public static RegexOptions Default
+        {
+            get
+            {
+                return RegexCompiledOption;
+            }
+        }
+    }
+}

StackExchange.Redis/StackExchange/Redis/ResultProcessor.cs

@@ -347,7 +347,7 @@ protected override bool SetResultCore(PhysicalConnection connection, Message mes
 
         internal sealed class ScriptLoadProcessor : ResultProcessor<byte[]>
         {
-            static readonly Regex sha1 = new Regex("^[0-9a-f]{40}$", RegexOptions.Compiled | RegexOptions.IgnoreCase);
+            static readonly Regex sha1 = new Regex("^[0-9a-f]{40}$", InternalRegexCompiledOption.Default | RegexOptions.IgnoreCase);
 
             internal static bool IsSHA1(string script)
             {

StackExchange.Redis/StackExchange/Redis/ScriptParameterMapper.cs

@@ -23,7 +23,7 @@ public ScriptParameters(RedisKey[] keys, RedisValue[] args)
             }
         }
 
-        static readonly Regex ParameterExtractor = new Regex(@"@(?<paramName> ([a-z]|_) ([a-z]|_|\d)*)", RegexOptions.Compiled | RegexOptions.IgnoreCase | RegexOptions.IgnorePatternWhitespace);
+        static readonly Regex ParameterExtractor = new Regex(@"@(?<paramName> ([a-z]|_) ([a-z]|_|\d)*)", InternalRegexCompiledOption.Default | RegexOptions.IgnoreCase | RegexOptions.IgnorePatternWhitespace);
         static string[] ExtractParameters(string script)
         {
             var ps = ParameterExtractor.Matches(script);

StackExchange.Redis_Net40/StackExchange.Redis_Net40.StrongName.csproj

@@ -120,6 +120,7 @@
     <Compile Include="..\StackExchange.Redis\StackExchange\Redis\IDatabaseAsync.cs" />
     <Compile Include="..\StackExchange.Redis\StackExchange\Redis\IMultiMessage.cs" />
     <Compile Include="..\StackExchange.Redis\StackExchange\Redis\InternalErrorEventArgs.cs" />
+    <Compile Include="..\StackExchange.Redis\StackExchange\Redis\InternalRegexCompiledOption.cs" />
     <Compile Include="..\StackExchange.Redis\StackExchange\Redis\IProfiler.cs" />
     <Compile Include="..\StackExchange.Redis\StackExchange\Redis\IRedis.cs" />
     <Compile Include="..\StackExchange.Redis\StackExchange\Redis\IRedisAsync.cs" />

StackExchange.Redis_Net40/StackExchange.Redis_Net40.csproj

@@ -117,6 +117,7 @@
     <Compile Include="..\StackExchange.Redis\StackExchange\Redis\IDatabaseAsync.cs" />
     <Compile Include="..\StackExchange.Redis\StackExchange\Redis\IMultiMessage.cs" />
     <Compile Include="..\StackExchange.Redis\StackExchange\Redis\InternalErrorEventArgs.cs" />
+    <Compile Include="..\StackExchange.Redis\StackExchange\Redis\InternalRegexCompiledOption.cs" />
     <Compile Include="..\StackExchange.Redis\StackExchange\Redis\IProfiler.cs" />
     <Compile Include="..\StackExchange.Redis\StackExchange\Redis\IRedis.cs" />
     <Compile Include="..\StackExchange.Redis\StackExchange\Redis\IRedisAsync.cs" />