diff --git a/src/main/scala/view/Markdown.scala b/src/main/scala/view/Markdown.scala
index 2e53c94..e7fdf02 100644
--- a/src/main/scala/view/Markdown.scala
+++ b/src/main/scala/view/Markdown.scala
@@ -78,7 +78,7 @@
     val html = super.toHtml(rootNode)
     if(enableIssueLink){
       // convert marked issue id to link.
-      html.replaceAll("#\\{\\{\\{\\{([0-9]+)\\}\\}\\}\\}",
+      html.replaceAll("#\\{\\{\\{\\{(\\d+)\\}\\}\\}\\}",
         "<a href=\"%s/%s/%s/issue/$1\">#$1</a>".format(context.path, repository.owner, repository.name))
     } else html
   }
@@ -113,7 +113,7 @@
     // mark issue id to link
     val startIndex = node.getStartIndex
     val text2 = if(enableIssueLink && startIndex > 0 && markdown.charAt(startIndex - 1) == '#'){
-      text1.replaceFirst("^([0-9]+)", "{{{{$0}}}}")
+      text1.replaceFirst("^(\\d+)", "{{{{$0}}}}")
     } else text1
 
     if (abbreviations.isEmpty) {
diff --git a/src/main/scala/view/helpers.scala b/src/main/scala/view/helpers.scala
index 42e697c..eb655e1 100644
--- a/src/main/scala/view/helpers.scala
+++ b/src/main/scala/view/helpers.scala
@@ -34,7 +34,7 @@
       // escape HTML tags
       .replaceAll("&", "&amp;").replaceAll("<", "&lt;").replaceAll(">", "&gt;").replaceAll("\"", "&quot;")
       // convert issue id to link
-      .replaceAll("(^|\\W)#([0-9]+)(\\W|$)", "$1<a href=\"%s/%s/%s/issues/$2\">#$2</a>$3".format(context.path, repository.owner, repository.name))
+      .replaceAll("(^|\\W)#(\\d+)(\\W|$)", "$1<a href=\"%s/%s/%s/issues/$2\">#$2</a>$3".format(context.path, repository.owner, repository.name))
       // convert commit id to link
       .replaceAll("(^|\\W)([a-f0-9]{40})(\\W|$)", "$1<a href=\"%s/%s/%s/commit/$2\">$2</a>$3").format(context.path, repository.owner, repository.name))