Add polyfill for Regex.Count(...)

PolyShim.Tests/Net70/RegexTests.cs

@@ -0,0 +1,43 @@
+using System;
+using System.Text.RegularExpressions;
+using FluentAssertions;
+using Xunit;
+
+namespace PolyShim.Tests.Net70;
+
+public class RegexTests
+{
+    [Fact]
+    public void Count_Test()
+    {
+        // Arrange
+        const string input = "There are 3 numbers: 42 and 100";
+
+        // Act & assert
+        new Regex(@"\d+")
+            .Count(input)
+            .Should()
+            .Be(3);
+        Regex.Count(input, @"\d+").Should().Be(3);
+    }
+
+    [Fact]
+    public void Count_Options_Test()
+    {
+        // Arrange
+        const string input = "There are 3 numbers: 42 and 100";
+
+        // Act & assert
+        Regex.Count(input, @"\d+", RegexOptions.None).Should().Be(3);
+    }
+
+    [Fact]
+    public void Count_OptionsAndTimeout_Test()
+    {
+        // Arrange
+        const string input = "There are 3 numbers: 42 and 100";
+
+        // Act & assert
+        Regex.Count(input, @"\d+", RegexOptions.None, TimeSpan.FromSeconds(1)).Should().Be(3);
+    }
+}

PolyShim/Net70/Regex.cs

@@ -0,0 +1,51 @@
+#if (NETCOREAPP && !NET7_0_OR_GREATER) || (NETFRAMEWORK) || (NETSTANDARD)
+#nullable enable
+// ReSharper disable RedundantUsingDirective
+// ReSharper disable CheckNamespace
+// ReSharper disable InconsistentNaming
+// ReSharper disable PartialTypeWithSinglePart
+
+using System;
+using System.Text.RegularExpressions;
+
+internal static partial class PolyfillExtensions
+{
+    extension(Regex regex)
+    {
+        // https://learn.microsoft.com/dotnet/api/system.text.regularexpressions.regex.count#system-text-regularexpressions-regex-count(system-string)
+        public int Count(string input)
+        {
+            var count = 0;
+            var match = regex.Match(input);
+            while (match.Success)
+            {
+                count++;
+                match = match.NextMatch();
+            }
+
+            return count;
+        }
+    }
+
+    extension(Regex)
+    {
+        // https://learn.microsoft.com/dotnet/api/system.text.regularexpressions.regex.count#system-text-regularexpressions-regex-count(system-string-system-string)
+        public static int Count(string input, string pattern) =>
+            Regex.Matches(input, pattern).Count;
+
+        // https://learn.microsoft.com/dotnet/api/system.text.regularexpressions.regex.count#system-text-regularexpressions-regex-count(system-string-system-string-system-text-regularexpressions-regexoptions)
+        public static int Count(string input, string pattern, RegexOptions options) =>
+            Regex.Matches(input, pattern, options).Count;
+
+#if !NETFRAMEWORK || NET45_OR_GREATER
+        // https://learn.microsoft.com/dotnet/api/system.text.regularexpressions.regex.count#system-text-regularexpressions-regex-count(system-string-system-string-system-text-regularexpressions-regexoptions-system-timespan)
+        public static int Count(
+            string input,
+            string pattern,
+            RegexOptions options,
+            TimeSpan matchTimeout
+        ) => Regex.Matches(input, pattern, options, matchTimeout).Count;
+#endif
+    }
+}
+#endif

PolyShim/Signatures.md

@@ -1,8 +1,8 @@
 # Signatures
 
-- **Total:** 233
+- **Total:** 237
 - **Types:** 62
-- **Members:** 171
+- **Members:** 175
 
 ___
 
@@ -200,6 +200,11 @@ ___
   - [`void NextBytes(Span<byte>)`](https://learn.microsoft.com/dotnet/api/system.random.nextbytes#system-random-nextbytes(system-span((system-byte)))) <sup><sub>.NET Core 2.1</sub></sup>
 - `Range`
   - [**[struct]**](https://learn.microsoft.com/dotnet/api/system.range) <sup><sub>.NET Core 3.0</sub></sup>
+- `Regex`
+  - [`int Count(string, string, RegexOptions, TimeSpan)`](https://learn.microsoft.com/dotnet/api/system.text.regularexpressions.regex.count#system-text-regularexpressions-regex-count(system-string-system-string-system-text-regularexpressions-regexoptions-system-timespan)) <sup><sub>.NET 7.0</sub></sup>
+  - [`int Count(string, string, RegexOptions)`](https://learn.microsoft.com/dotnet/api/system.text.regularexpressions.regex.count#system-text-regularexpressions-regex-count(system-string-system-string-system-text-regularexpressions-regexoptions)) <sup><sub>.NET 7.0</sub></sup>
+  - [`int Count(string, string)`](https://learn.microsoft.com/dotnet/api/system.text.regularexpressions.regex.count#system-text-regularexpressions-regex-count(system-string-system-string)) <sup><sub>.NET 7.0</sub></sup>
+  - [`int Count(string)`](https://learn.microsoft.com/dotnet/api/system.text.regularexpressions.regex.count#system-text-regularexpressions-regex-count(system-string)) <sup><sub>.NET 7.0</sub></sup>
 - `RequiredMemberAttribute`
   - [**[class]**](https://learn.microsoft.com/dotnet/api/system.runtime.compilerservices.requiredmemberattribute) <sup><sub>.NET 7.0</sub></sup>
 - `RequiresAssemblyFilesAttribute`