From 411bd6d2d98e355bd7aa487809165ad4b00b113a Mon Sep 17 00:00:00 2001
From: Yufei Huang <yufeih@live.com>
Date: Thu, 18 May 2023 08:02:35 +0800
Subject: [PATCH] fix: allow dash as tag name in markdig code snippet syntax
 (#8783)

---
 .../CodeSnippet/CodeSnippetExtractor.cs       |  2 +-
 .../CodeSnippetTest.cs                        | 47 ++++++++++++++++++-
 2 files changed, 47 insertions(+), 2 deletions(-)

diff --git a/src/Microsoft.DocAsCode.MarkdigEngine.Extensions/CodeSnippet/CodeSnippetExtractor.cs b/src/Microsoft.DocAsCode.MarkdigEngine.Extensions/CodeSnippet/CodeSnippetExtractor.cs
index 4aba3c6aef7..db3f90cf821 100644
--- a/src/Microsoft.DocAsCode.MarkdigEngine.Extensions/CodeSnippet/CodeSnippetExtractor.cs
+++ b/src/Microsoft.DocAsCode.MarkdigEngine.Extensions/CodeSnippet/CodeSnippetExtractor.cs
@@ -9,7 +9,7 @@ namespace Microsoft.DocAsCode.MarkdigEngine.Extensions;
 
 public class CodeSnippetExtractor
 {
-    private static readonly Regex TagnameFormat = new(@"^[\w\.]+$", RegexOptions.Compiled | RegexOptions.IgnoreCase);
+    private static readonly Regex TagnameFormat = new(@"^[\w\.-]+$", RegexOptions.Compiled | RegexOptions.IgnoreCase);
     private readonly string StartLineTemplate;
     private readonly string EndLineTemplate;
     private readonly bool IsEndLineContainsTagName;
diff --git a/test/Microsoft.DocAsCode.MarkdigEngine.Extensions.Tests/CodeSnippetTest.cs b/test/Microsoft.DocAsCode.MarkdigEngine.Extensions.Tests/CodeSnippetTest.cs
index 126eb2e098f..c0dbbceeb39 100644
--- a/test/Microsoft.DocAsCode.MarkdigEngine.Extensions.Tests/CodeSnippetTest.cs
+++ b/test/Microsoft.DocAsCode.MarkdigEngine.Extensions.Tests/CodeSnippetTest.cs
@@ -292,7 +292,7 @@ public void TestDfmFencesBlockLevel()
     }
 
     [Theory]
-            [Trait("Related", "DfmMarkdown")]
+    [Trait("Related", "DfmMarkdown")]
     #region Inline Data
     [InlineData(@"[!code-csharp[Main](Program.cs)]", @"<pre><code class=""lang-csharp"" name=""Main"">namespace ConsoleApplication1
 {
@@ -609,6 +609,51 @@ public void TestDfmFencesBlockLevelWithWhitespaceLeading()
         });
     }
 
+    [Fact]
+    public void Issue8777()
+    {
+        TestUtility.VerifyMarkup(
+            """
+            [!code-csharp[Main](Greet.cs?name=hello-world-message)]
+            """,
+            """
+            <pre><code class="lang-csharp" name="Main">
+            namespace HelloWorld
+            {
+                public class Greet
+                {
+                    public string Who { get; private set; }
+            
+                    public Greet(string who)
+                    {
+                        Who = who;
+                    }
+                }
+            }</code></pre>
+            """,
+            files: new Dictionary<string, string>
+            {
+                {
+                    "Greet.cs", """
+                        #region hello-world-message
+                        namespace HelloWorld
+                        {
+                            public class Greet
+                            {
+                                public string Who { get; private set; }
+
+                                public Greet(string who)
+                                {
+                                    Who = who;
+                                }
+                            }
+                        }
+                        #endregion
+                        """
+                },
+            });
+    }
+
     [Fact]
     [Trait("Related", "DfmMarkdown")]
     public void TestDfmFencesBlockLevelWithWorkingFolder()