diff --git a/src/utils/vutils.cpp b/src/utils/vutils.cpp
index 84ef50b8..e21aec6f 100644
--- a/src/utils/vutils.cpp
+++ b/src/utils/vutils.cpp
@@ -43,9 +43,9 @@ const QString VUtils::c_fencedCodeBlockEndRegExp = QString("^(\\s*)```$");
 
 const QString VUtils::c_previewImageBlockRegExp = QString("[\\n|^][ |\\t]*\\xfffc[ |\\t]*(?=\\n)");
 
-const QString VUtils::c_headerRegExp = QString("^(#{1,6})\\s+(((\\d+\\.)+(?=\\s))?\\s?\\S.*)\\s*$");
+const QString VUtils::c_headerRegExp = QString("^(#{1,6})\\s+(((\\d+\\.)+(?=\\s))?\\s*(\\S.*)?)$");
 
-const QString VUtils::c_headerPrefixRegExp = QString("^(#{1,6}\\s+((\\d+\\.)+(?=\\s))?\\s?)($|\\S.*\\s*$)");
+const QString VUtils::c_headerPrefixRegExp = QString("^(#{1,6}\\s+((\\d+\\.)+(?=\\s))?\\s*)($|(\\S.*)?$)");
 
 void VUtils::initAvailableLanguage()
 {