Better regex pattern

Author: carlossanlop

src/PortToDocs/src/libraries/XmlHelper.cs

@@ -62,7 +62,7 @@ internal class XmlHelper
             { @"\<(see|seealso){1} cref\=""dynamic""[ ]*\/\>", "<see langword=\"dynamic\" />" },
             { @"\<(see|seealso){1} cref\=""string""[ ]*\/\>",  "<see cref=\"T:System.String\" />" },
             { @"<code data-dev-comment-type=""(?<elementName>[a-zA-Z0-9_]+)"">(?<elementValue>[a-zA-Z0-9_]+)</code>", "<see ${elementName}=\"${elementValue}\" />" },
-            { @"<xref data-throw-if-not-resolved=""[a-zA-Z0-9_]+"" uid=""(?<docId>.+)""><\/xref>", "<see cref=\"T:${docId}\" />" },
+            { @"<xref data-throw-if-not-resolved=""[a-zA-Z0-9_]+"" uid=""(?<docId>[a-zA-Z0-9_,\<\>\.\@\#\$%^&`\(\)]+)""><\/xref>", "<see cref=\"T:${docId}\" />" },
         };
 
         private static readonly Dictionary<string, string> _replaceableMarkdownPatterns = new Dictionary<string, string> {
@@ -123,7 +123,7 @@ internal class XmlHelper
             { @"\<(typeparamref|paramref){1} name\=""(?'refNameContents'[a-zA-Z0-9_\-]+)""[ ]*\/\>",  @"`${refNameContents}`" },
             { @"\<see langword\=""(?'seeLangwordContents'[a-zA-Z0-9_\-]+)""[ ]*\/\>",  @"`${seeLangwordContents}`" },
             { @"<code data-dev-comment-type=""[a-zA-Z0-9_]+"">(?<elementValue>[a-zA-Z0-9_]+)</code>", "`${elementValue}`" },
-            { @"<xref data-throw-if-not-resolved=""[a-zA-Z0-9_]+"" uid=""(?<docId>.+)""><\/xref>", "<xref:${docId}>" },
+            { @"<xref data-throw-if-not-resolved=""[a-zA-Z0-9_]+"" uid=""(?<docId>[a-zA-Z0-9_,\<\>\.]+)""><\/xref>", "<xref:${docId}>" },
         };
 
         private static readonly string[] _splittingSeparators = new string[] { "\r", "\n", "\r\n" };