diff --git a/src/main/scala/view/LinkConverter.scala b/src/main/scala/view/LinkConverter.scala
index f15bfe6..121cb2d 100644
--- a/src/main/scala/view/LinkConverter.scala
+++ b/src/main/scala/view/LinkConverter.scala
@@ -14,22 +14,21 @@
       // escape HTML tags
       .replaceAll("&", "&amp;").replaceAll("<", "&lt;").replaceAll(">", "&gt;").replaceAll("\"", "&quot;")
       // convert issue id to link
-      .replaceBy(("(^|\\W)" + issueIdPrefix + "(\\d+)(\\W|$)").r){ m =>
+      .replaceBy(("(?<=(^|\\W))" + issueIdPrefix + "([0-9]+)(?=(\\W|$))").r){ m =>
         getIssue(repository.owner, repository.name, m.group(2)) match {
           case Some(issue) if(issue.isPullRequest)
-                       => Some(s"""${m.group(1)}<a href="${context.path}/${repository.owner}/${repository.name}/pull/${m.group(2)}">#${m.group(2)}</a>${m.group(3)}""")
-          case Some(_) => Some(s"""${m.group(1)}<a href="${context.path}/${repository.owner}/${repository.name}/issues/${m.group(2)}">#${m.group(2)}</a>${m.group(3)}""")
-          case None    => Some(s"""${m.group(1)}#${m.group(2)}${m.group(3)}""")
-
+                       => Some(s"""<a href="${context.path}/${repository.owner}/${repository.name}/pull/${m.group(2)}">#${m.group(2)}</a>""")
+          case Some(_) => Some(s"""<a href="${context.path}/${repository.owner}/${repository.name}/issues/${m.group(2)}">#${m.group(2)}</a>""")
+          case None    => Some(s"""#${m.group(2)}""")
         }
       }
       // convert @username to link
-      .replaceBy("(^|\\W)@([a-zA-Z0-9\\-_]+)(\\W|$)".r){ m =>
+      .replaceBy("(?<=(^|\\W))@([a-zA-Z0-9\\-_]+)(?=(\\W|$))".r){ m =>
         getAccountByUserName(m.group(2)).map { _ =>
-          s"""${m.group(1)}<a href="${context.path}/${m.group(2)}">@${m.group(2)}</a>${m.group(3)}"""
+          s"""<a href="${context.path}/${m.group(2)}">@${m.group(2)}</a>"""
         }
       }
       // convert commit id to link
-      .replaceAll("(^|\\W)([a-f0-9]{40})(\\W|$)", s"""$$1<a href="${context.path}/${repository.owner}/${repository.name}/commit/$$2">$$2</a>$$3""")
+      .replaceAll("(?<=(^|\\W))([a-f0-9]{40})(?=(\\W|$))", s"""<a href="${context.path}/${repository.owner}/${repository.name}/commit/$$2">$$2</a>""")
   }
 }
diff --git a/src/main/scala/view/Markdown.scala b/src/main/scala/view/Markdown.scala
index 90da6da..7d796ee 100644
--- a/src/main/scala/view/Markdown.scala
+++ b/src/main/scala/view/Markdown.scala
@@ -19,7 +19,7 @@
              enableWikiLink: Boolean, enableRefsLink: Boolean)(implicit context: app.Context): String = {
     // escape issue id
     val source = if(enableRefsLink){
-      markdown.replaceAll("(^|\\W)#([0-9]+)(\\W|$)", "$1issue:$2$3")
+      markdown.replaceAll("(?<=(\\W|^))#(\\d+)(?=(\\W|$))", "issue:$2")
     } else markdown
 
     val rootNode = new PegDownProcessor(