Add regular expressions from vscode-markdownlint for error range in results.

demo/default.js

@@ -67,6 +67,12 @@
             sanitize(result.errorContext) +
             "\"</span>]" :
           "");
+        /* + (result.errorRange ?
+          " <u style='white-space: pre-wrap'>" +
+            lines[result.lineNumber - 1].substr(
+              result.errorRange[0] - 1, result.errorRange[1]) +
+            "</u>" :
+          ""); */
     }).join("<br/>");
   }