Cosmos: Add translator for Regex.IsMatch method

Fixes dotnet#28078

Author: Marusyk

src/EFCore.Cosmos/Query/Internal/CosmosMethodCallTranslatorProvider.cs

@@ -33,7 +33,8 @@ public CosmosMethodCallTranslatorProvider(
                 new CosmosStringMethodTranslator(sqlExpressionFactory),
                 new ContainsTranslator(sqlExpressionFactory),
                 new RandomTranslator(sqlExpressionFactory),
-                new MathTranslator(sqlExpressionFactory)
+                new MathTranslator(sqlExpressionFactory),
+                new RegexMethodTranslator(sqlExpressionFactory)
                 //new LikeTranslator(sqlExpressionFactory),
                 //new EnumHasFlagTranslator(sqlExpressionFactory),
                 //new GetValueOrDefaultTranslator(sqlExpressionFactory),

src/EFCore.Cosmos/Query/Internal/RegexMethodTranslator.cs

@@ -0,0 +1,66 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Text.RegularExpressions;
+
+namespace Microsoft.EntityFrameworkCore.Cosmos.Query.Internal;
+
+/// <summary>
+///     This is an internal API that supports the Entity Framework Core infrastructure and not subject to
+///     the same compatibility standards as public APIs. It may be changed or removed without notice in
+///     any release. You should only use it directly in your code with extreme caution and knowing that
+///     doing so can result in application failures when updating to a new Entity Framework Core release.
+/// </summary>
+public class RegexMethodTranslator : IMethodCallTranslator
+{
+    private static readonly HashSet<MethodInfo> MethodInfoDataLengthMapping
+        = new()
+        {
+            typeof(Regex).GetRuntimeMethod(nameof(Regex.IsMatch), new[] { typeof(string), typeof(string) })!,
+            typeof(Regex).GetRuntimeMethod(nameof(Regex.IsMatch), new[] { typeof(ReadOnlySpan<char>), typeof(string) })!
+        };
+
+    private readonly ISqlExpressionFactory _sqlExpressionFactory;
+
+    /// <summary>
+    ///     This is an internal API that supports the Entity Framework Core infrastructure and not subject to
+    ///     the same compatibility standards as public APIs. It may be changed or removed without notice in
+    ///     any release. You should only use it directly in your code with extreme caution and knowing that
+    ///     doing so can result in application failures when updating to a new Entity Framework Core release.
+    /// </summary>
+    public RegexMethodTranslator(ISqlExpressionFactory sqlExpressionFactory)
+    {
+        _sqlExpressionFactory = sqlExpressionFactory;
+    }
+
+    /// <summary>
+    ///     This is an internal API that supports the Entity Framework Core infrastructure and not subject to
+    ///     the same compatibility standards as public APIs. It may be changed or removed without notice in
+    ///     any release. You should only use it directly in your code with extreme caution and knowing that
+    ///     doing so can result in application failures when updating to a new Entity Framework Core release.
+    /// </summary>
+    public virtual SqlExpression? Translate(
+        SqlExpression? instance,
+        MethodInfo method,
+        IReadOnlyList<SqlExpression> arguments,
+        IDiagnosticsLogger<DbLoggerCategory.Query> logger)
+    {
+        if (MethodInfoDataLengthMapping.Contains(method))
+        {
+            var typeMapping = arguments.Count == 2
+                ? ExpressionExtensions.InferTypeMapping(arguments[0], arguments[1])
+                : ExpressionExtensions.InferTypeMapping(arguments[0], arguments[1], arguments[2]);
+
+            var newArguments = arguments.Select(e => _sqlExpressionFactory.ApplyTypeMapping(e, typeMapping));
+
+            return _sqlExpressionFactory.Function(
+                "RegexMatch",
+                newArguments,
+                method.ReturnType,
+                typeMapping);
+        }
+
+        return null;
+    }
+}
+

test/EFCore.Cosmos.FunctionalTests/Query/NorthwindFunctionsQueryCosmosTest.cs

@@ -1204,18 +1204,22 @@ public override async Task Int_Compare_to_simple_zero(bool async)
 
     public override async Task Regex_IsMatch_MethodCall(bool async)
     {
-        // Cosmos client evaluation. Issue #17246.
-        await AssertTranslationFailed(() => base.Regex_IsMatch_MethodCall(async));
+        await base.Regex_IsMatch_MethodCall(async);
 
-        AssertSql();
+        AssertSql(
+           @"SELECT c
+FROM root c
+WHERE ((c[""Discriminator""] = ""Customer"") AND RegexMatch(c[""CustomerID""], ""^T""))");
     }
 
     public override async Task Regex_IsMatch_MethodCall_constant_input(bool async)
     {
-        // Cosmos client evaluation. Issue #17246.
-        await AssertTranslationFailed(() => base.Regex_IsMatch_MethodCall_constant_input(async));
+        await base.Regex_IsMatch_MethodCall_constant_input(async);
 
-        AssertSql();
+        AssertSql(
+           @"SELECT c
+FROM root c
+WHERE ((c[""Discriminator""] = ""Customer"") AND RegexMatch(""ALFKI"", c[""CustomerID""]))");
     }
 
     [ConditionalTheory]