underlined md added

@@ -451,8 +451,8 @@ This document was created to test the robustness of Markdown parsers and to ensu
                                       textAlign: TextAlign.justify,
                                       textAlign: TextAlign.justify,
                                       textScaler: const TextScaler.linear(1),
                                       textScaler: const TextScaler.linear(1),
                                       style: const TextStyle(
                                       style: const TextStyle(
-                                        fontFamily: 'monospace',
-                                        fontWeight: FontWeight.bold,
+                                          // fontFamily: 'monospace',
+                                          // fontWeight: FontWeight.bold,
                                           ),
                                           ),
                                       highlightBuilder: (context, text, style) {
                                       highlightBuilder: (context, text, style) {
                                         return Container(
                                         return Container(

@@ -24,6 +24,7 @@ abstract class MarkdownComponent {
     StrikeMd(),
     StrikeMd(),
     BoldMd(),
     BoldMd(),
     ItalicMd(),
     ItalicMd(),
+    UnderLineMd(),
     LatexMath(),
     LatexMath(),
     LatexMathMultiLine(),
     LatexMathMultiLine(),
     HighlightedText(),
     HighlightedText(),
@@ -1164,3 +1165,33 @@ class CodeBlockMd extends BlockMd {
         CodeField(name: name, codes: codes);
         CodeField(name: name, codes: codes);
   }
   }
 }
 }
+
+class UnderLineMd extends InlineMd {
+  @override
+  RegExp get exp =>
+      RegExp(r"<u>(.*?)(?:</u>|$)", multiLine: true, dotAll: true);
+
+  @override
+  InlineSpan span(
+    BuildContext context,
+    String text,
+    final GptMarkdownConfig config,
+  ) {
+    var match = exp.firstMatch(text.trim());
+    var conf = config.copyWith(
+      style: (config.style ?? const TextStyle()).copyWith(
+        decoration: TextDecoration.underline,
+        decorationColor: config.style?.color,
+      ),
+    );
+    return TextSpan(
+      children: MarkdownComponent.generate(
+        context,
+        "${match?[1]}",
+        conf,
+        false,
+      ),
+      style: conf.style,
+    );
+  }
+}