diff --git a/src/code.js b/src/code.js
index 851a1ff..08f08b6 100644
--- a/src/code.js
+++ b/src/code.js
@@ -91,8 +91,7 @@ function execute() {
 }
 
 function replace_heading(level, text) {
-  var stripped;
-  stripped = text.replace(/^(\d+\.){1,}/i, '').replace(/^\d+．|\d+\s/, '').replace(/(^\s+)|(\s+$)/g, '');
+  const stripped = text.replace(/^(\d+[\.．]){1,}/i, '').replace(/^\d+[\s　]/, '').replace(/^[\s　]+/, '');
   level.push(' ');
   return level.join('.') + stripped;
 }