diff --git a/src/common/folding.cc b/src/common/folding.cc
index a5bceffb..b28397b4 100644
--- a/src/common/folding.cc
+++ b/src/common/folding.cc
@@ -22,8 +22,8 @@ std::u32string apply( std::u32string const & in, bool preserveWildcards )
 {
   // remove diacritics (normalization), white space, punt,
   auto temp = QString::fromStdU32String( in )
-                .normalized( QString::NormalizationForm_KD )
                 .remove( RX::markSpace )
+                .normalized( QString::NormalizationForm_KD )
                 .removeIf( [ preserveWildcards ]( const QChar & ch ) -> bool {
                   return ch.isPunct()
                     && !( preserveWildcards && ( ch == '\\' || ch == '?' || ch == '*' || ch == '[' || ch == ']' ) );
@@ -155,8 +155,7 @@ std::u32string applyWhitespaceAndPunctOnly( std::u32string const & in )
 
 bool isWhitespace( char32_t ch )
 {
-  //invisible character should be treated as whitespace as well.
-  return QChar::isSpace( ch ) || !QChar::isPrint( ch );
+  return QChar::isSpace( ch );
 }
 
 bool isWhitespaceOrPunct( char32_t ch )
diff --git a/src/common/globalregex.hh b/src/common/globalregex.hh
index 85fbc460..c9068960 100644
--- a/src/common/globalregex.hh
+++ b/src/common/globalregex.hh
@@ -71,8 +71,8 @@ const static QRegularExpression accentMark( R"(\p{M})", QRegularExpression::UseU
 //contain unicode space mark,invisible, and punctuation
 const static QRegularExpression markPuncSpace( R"([\p{M}\p{Z}\p{C}\p{P}])",
                                                QRegularExpression::UseUnicodePropertiesOption );
-//contain unicode space and mark.invisible
-const static QRegularExpression markSpace( R"([\p{M}\p{Z}\p{C}])", QRegularExpression::UseUnicodePropertiesOption );
+//contain unicode space and mark.
+const static QRegularExpression markSpace( R"([\p{M}\p{Z}])", QRegularExpression::UseUnicodePropertiesOption );
 
 const static QRegularExpression whiteSpace( "\\s+" );