Fix regex ignorecase and ensure there are all Compiled for best performance

Author: onizet

src/Html2OpenXml/Expressions/AbbreviationExpression.cs

@@ -22,7 +22,7 @@ namespace HtmlToOpenXml.Expressions;
 /// </summary>
 sealed class AbbreviationExpression(IHtmlElement node) : PhrasingElementExpression(node)
 {
-    private static readonly Regex linkRegex = new(@"^((https?|ftps?|mailto|file)://|[\\]{2})(?:[\w][\w.-]?)", RegexOptions.Compiled, TimeSpan.FromMilliseconds(100));
+    private static readonly Regex linkRegex = new(@"^((https?|ftps?|mailto|file)://|[\\]{2})(?:[\w][\w.-]?)", RegexOptions.IgnoreCase | RegexOptions.Compiled, TimeSpan.FromMilliseconds(100));
 
 
     /// <inheritdoc/>

src/Html2OpenXml/IO/DataUri.cs

@@ -23,7 +23,7 @@ public sealed class DataUri
     // mime-type can be: svg+xml, x-png
     private readonly static Regex dataUriRegex = new(
             @"data\:(?<mime>\w+/[\w\-\+\.]+)?(?:;charset=(?<charset>[a-zA-Z_0-9-]+))?(?<base64>;base64)?,(?<data>.*)",
-            RegexOptions.IgnoreCase | RegexOptions.Singleline,
+            RegexOptions.IgnoreCase | RegexOptions.Singleline | RegexOptions.Compiled,
             TimeSpan.FromMilliseconds(200));
 
     private DataUri(string mime, byte[] data)