diff --git a/src/common/Helpers.cpp b/src/common/Helpers.cpp
index 5cceaaca..b62b093c 100644
--- a/src/common/Helpers.cpp
+++ b/src/common/Helpers.cpp
@@ -278,4 +278,12 @@ void emitColumnChanged(QAbstractItemModel *model, int column)
     }
 }
 
+bool filterStringContains(const QString &string, const QSortFilterProxyModel *model)
+{
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
+    return string.contains(model->filterRegExp());
+#else
+    return string.contains(model->filterRegularExpression());
+#endif
+}
 } // end namespace
diff --git a/src/common/Helpers.h b/src/common/Helpers.h
index 2a2da821..38462d55 100644
--- a/src/common/Helpers.h
+++ b/src/common/Helpers.h
@@ -23,6 +23,7 @@ class QAction;
 class QMenu;
 class QPaintDevice;
 class QComboBox;
+class QSortFilterProxyModel;
 
 #if QT_VERSION < QT_VERSION_CHECK(5, 14, 0)
 #    define CUTTER_QT_SKIP_EMPTY_PARTS QString::SkipEmptyParts
@@ -83,6 +84,7 @@ CUTTER_EXPORT void selectIndexByData(QComboBox *comboBox, QVariant data, int def
  */
 CUTTER_EXPORT void emitColumnChanged(QAbstractItemModel *model, int column);
 
+CUTTER_EXPORT bool filterStringContains(const QString &string, const QSortFilterProxyModel *model);
 } // qhelpers
 
 #endif // HELPERS_H
diff --git a/src/dialogs/AttachProcDialog.cpp b/src/dialogs/AttachProcDialog.cpp
index d2e8f42e..5c0abed3 100644
--- a/src/dialogs/AttachProcDialog.cpp
+++ b/src/dialogs/AttachProcDialog.cpp
@@ -156,7 +156,7 @@ bool ProcessProxyModel::filterAcceptsRow(int row, const QModelIndex &parent) con
     QModelIndex index = sourceModel()->index(row, 0, parent);
     ProcessDescription item =
             index.data(ProcessModel::ProcDescriptionRole).value<ProcessDescription>();
-    return item.path.contains(filterRegExp());
+    return qhelpers::filterStringContains(item.path, this);
 }
 
 bool ProcessProxyModel::lessThan(const QModelIndex &left, const QModelIndex &right) const
diff --git a/src/widgets/ClassesWidget.cpp b/src/widgets/ClassesWidget.cpp
index b20f1935..ade8af4d 100644
--- a/src/widgets/ClassesWidget.cpp
+++ b/src/widgets/ClassesWidget.cpp
@@ -525,7 +525,7 @@ ClassesSortFilterProxyModel::ClassesSortFilterProxyModel(QObject *parent)
 bool ClassesSortFilterProxyModel::filterAcceptsRow(int row, const QModelIndex &parent) const
 {
     QModelIndex index = sourceModel()->index(row, 0, parent);
-    return index.data(ClassesModel::NameRole).toString().contains(filterRegExp());
+    return qhelpers::filterStringContains(index.data(ClassesModel::NameRole).toString(), this);
 }
 
 bool ClassesSortFilterProxyModel::lessThan(const QModelIndex &left, const QModelIndex &right) const
diff --git a/src/widgets/CommentsWidget.cpp b/src/widgets/CommentsWidget.cpp
index 29f98025..6fc98b3c 100644
--- a/src/widgets/CommentsWidget.cpp
+++ b/src/widgets/CommentsWidget.cpp
@@ -195,7 +195,7 @@ bool CommentsProxyModel::filterAcceptsRow(int row, const QModelIndex &parent) co
     QModelIndex index = sourceModel()->index(row, 0, parent);
     auto comment = index.data(CommentsModel::CommentDescriptionRole).value<CommentDescription>();
 
-    return comment.name.contains(filterRegExp());
+    return qhelpers::filterStringContains(comment.name, this);
 }
 
 bool CommentsProxyModel::lessThan(const QModelIndex &left, const QModelIndex &right) const
diff --git a/src/widgets/ExportsWidget.cpp b/src/widgets/ExportsWidget.cpp
index 8eee5207..2f7884a8 100644
--- a/src/widgets/ExportsWidget.cpp
+++ b/src/widgets/ExportsWidget.cpp
@@ -98,7 +98,7 @@ bool ExportsProxyModel::filterAcceptsRow(int row, const QModelIndex &parent) con
     QModelIndex index = sourceModel()->index(row, 0, parent);
     auto exp = index.data(ExportsModel::ExportDescriptionRole).value<ExportDescription>();
 
-    return exp.name.contains(filterRegExp());
+    return qhelpers::filterStringContains(exp.name, this);
 }
 
 bool ExportsProxyModel::lessThan(const QModelIndex &left, const QModelIndex &right) const
diff --git a/src/widgets/FlagsWidget.cpp b/src/widgets/FlagsWidget.cpp
index 792ab435..12c775c3 100644
--- a/src/widgets/FlagsWidget.cpp
+++ b/src/widgets/FlagsWidget.cpp
@@ -107,7 +107,7 @@ bool FlagsSortFilterProxyModel::filterAcceptsRow(int row, const QModelIndex &par
 {
     QModelIndex index = sourceModel()->index(row, 0, parent);
     FlagDescription flag = index.data(FlagsModel::FlagDescriptionRole).value<FlagDescription>();
-    return flag.name.contains(filterRegExp()) || flag.realname.contains(filterRegExp());
+    return qhelpers::filterStringContains(flag.name, this);
 }
 
 bool FlagsSortFilterProxyModel::lessThan(const QModelIndex &left, const QModelIndex &right) const
diff --git a/src/widgets/FunctionsWidget.cpp b/src/widgets/FunctionsWidget.cpp
index f5875ee3..b04f6169 100644
--- a/src/widgets/FunctionsWidget.cpp
+++ b/src/widgets/FunctionsWidget.cpp
@@ -368,7 +368,8 @@ bool FunctionSortFilterProxyModel::filterAcceptsRow(int row, const QModelIndex &
     QModelIndex index = sourceModel()->index(row, 0, parent);
     FunctionDescription function =
             index.data(FunctionModel::FunctionDescriptionRole).value<FunctionDescription>();
-    return function.name.contains(filterRegExp());
+
+    return qhelpers::filterStringContains(function.name, this);
 }
 
 bool FunctionSortFilterProxyModel::lessThan(const QModelIndex &left, const QModelIndex &right) const
diff --git a/src/widgets/HeadersWidget.cpp b/src/widgets/HeadersWidget.cpp
index d5740734..80056b4e 100644
--- a/src/widgets/HeadersWidget.cpp
+++ b/src/widgets/HeadersWidget.cpp
@@ -89,7 +89,7 @@ bool HeadersProxyModel::filterAcceptsRow(int row, const QModelIndex &parent) con
     QModelIndex index = sourceModel()->index(row, 0, parent);
     HeaderDescription item =
             index.data(HeadersModel::HeaderDescriptionRole).value<HeaderDescription>();
-    return item.name.contains(filterRegExp());
+    return qhelpers::filterStringContains(item.name, this);
 }
 
 bool HeadersProxyModel::lessThan(const QModelIndex &left, const QModelIndex &right) const
diff --git a/src/widgets/ImportsWidget.cpp b/src/widgets/ImportsWidget.cpp
index 261a11b3..49174c8d 100644
--- a/src/widgets/ImportsWidget.cpp
+++ b/src/widgets/ImportsWidget.cpp
@@ -123,7 +123,7 @@ bool ImportsProxyModel::filterAcceptsRow(int row, const QModelIndex &parent) con
     QModelIndex index = sourceModel()->index(row, 0, parent);
     auto import = index.data(ImportsModel::ImportDescriptionRole).value<ImportDescription>();
 
-    return import.name.contains(filterRegExp());
+    return qhelpers::filterStringContains(import.name, this);
 }
 
 bool ImportsProxyModel::lessThan(const QModelIndex &left, const QModelIndex &right) const
diff --git a/src/widgets/MemoryMapWidget.cpp b/src/widgets/MemoryMapWidget.cpp
index bcf189c7..7912a0de 100644
--- a/src/widgets/MemoryMapWidget.cpp
+++ b/src/widgets/MemoryMapWidget.cpp
@@ -88,7 +88,7 @@ bool MemoryProxyModel::filterAcceptsRow(int row, const QModelIndex &parent) cons
     QModelIndex index = sourceModel()->index(row, 0, parent);
     MemoryMapDescription item =
             index.data(MemoryMapModel::MemoryDescriptionRole).value<MemoryMapDescription>();
-    return item.name.contains(filterRegExp());
+    return qhelpers::filterStringContains(item.name, this);
 }
 
 bool MemoryProxyModel::lessThan(const QModelIndex &left, const QModelIndex &right) const
diff --git a/src/widgets/ProcessesWidget.cpp b/src/widgets/ProcessesWidget.cpp
index 34896a4c..29049da7 100644
--- a/src/widgets/ProcessesWidget.cpp
+++ b/src/widgets/ProcessesWidget.cpp
@@ -191,7 +191,7 @@ bool ProcessesFilterModel::filterAcceptsRow(int row, const QModelIndex &parent)
     // All columns are checked for a match
     for (int i = COLUMN_PID; i <= COLUMN_PATH; ++i) {
         QModelIndex index = sourceModel()->index(row, i, parent);
-        if (sourceModel()->data(index).toString().contains(filterRegExp())) {
+        if (qhelpers::filterStringContains(sourceModel()->data(index).toString(), this)) {
             return true;
         }
     }
diff --git a/src/widgets/RegisterRefsWidget.cpp b/src/widgets/RegisterRefsWidget.cpp
index 232db549..3718bec1 100644
--- a/src/widgets/RegisterRefsWidget.cpp
+++ b/src/widgets/RegisterRefsWidget.cpp
@@ -90,7 +90,7 @@ bool RegisterRefProxyModel::filterAcceptsRow(int row, const QModelIndex &parent)
     QModelIndex index = sourceModel()->index(row, 0, parent);
     RegisterRefDescription item = index.data(RegisterRefModel::RegisterRefDescriptionRole)
                                           .value<RegisterRefDescription>();
-    return item.reg.contains(filterRegExp());
+    return qhelpers::filterStringContains(item.reg, this);
 }
 
 bool RegisterRefProxyModel::lessThan(const QModelIndex &left, const QModelIndex &right) const
diff --git a/src/widgets/RelocsWidget.cpp b/src/widgets/RelocsWidget.cpp
index bb3e7587..f23d971e 100644
--- a/src/widgets/RelocsWidget.cpp
+++ b/src/widgets/RelocsWidget.cpp
@@ -93,7 +93,7 @@ bool RelocsProxyModel::filterAcceptsRow(int row, const QModelIndex &parent) cons
     QModelIndex index = sourceModel()->index(row, 0, parent);
     auto reloc = index.data(RelocsModel::RelocDescriptionRole).value<RelocDescription>();
 
-    return reloc.name.contains(filterRegExp());
+    return qhelpers::filterStringContains(reloc.name, this);
 }
 
 bool RelocsProxyModel::lessThan(const QModelIndex &left, const QModelIndex &right) const
diff --git a/src/widgets/SearchWidget.cpp b/src/widgets/SearchWidget.cpp
index dca8f970..b4d38589 100644
--- a/src/widgets/SearchWidget.cpp
+++ b/src/widgets/SearchWidget.cpp
@@ -145,7 +145,7 @@ bool SearchSortFilterProxyModel::filterAcceptsRow(int row, const QModelIndex &pa
     QModelIndex index = sourceModel()->index(row, 0, parent);
     SearchDescription search =
             index.data(SearchModel::SearchDescriptionRole).value<SearchDescription>();
-    return search.code.contains(filterRegExp());
+    return qhelpers::filterStringContains(search.code, this);
 }
 
 bool SearchSortFilterProxyModel::lessThan(const QModelIndex &left, const QModelIndex &right) const
diff --git a/src/widgets/StringsWidget.cpp b/src/widgets/StringsWidget.cpp
index 7c3dec30..290c3af7 100644
--- a/src/widgets/StringsWidget.cpp
+++ b/src/widgets/StringsWidget.cpp
@@ -103,15 +103,26 @@ StringsProxyModel::StringsProxyModel(StringsModel *sourceModel, QObject *parent)
     setSortCaseSensitivity(Qt::CaseInsensitive);
 }
 
+void StringsProxyModel::setSelectedSection(QString section)
+{
+    selectedSection = section;
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
+    invalidateFilter();
+#else
+    invalidateRowsFilter();
+#endif
+}
+
 bool StringsProxyModel::filterAcceptsRow(int row, const QModelIndex &parent) const
 {
     QModelIndex index = sourceModel()->index(row, 0, parent);
     StringDescription str =
             index.data(StringsModel::StringDescriptionRole).value<StringDescription>();
-    if (selectedSection.isEmpty())
-        return str.string.contains(filterRegExp());
-    else
-        return selectedSection == str.section && str.string.contains(filterRegExp());
+    if (selectedSection.isEmpty()) {
+        return qhelpers::filterStringContains(str.string, this);
+    } else {
+        return selectedSection == str.section && qhelpers::filterStringContains(str.string, this);
+    }
 }
 
 bool StringsProxyModel::lessThan(const QModelIndex &left, const QModelIndex &right) const
@@ -198,8 +209,7 @@ StringsWidget::StringsWidget(MainWindow *main)
             [this]() { qhelpers::emitColumnChanged(model, StringsModel::CommentColumn); });
 
     connect(ui->quickFilterView->comboBox(), &QComboBox::currentTextChanged, this, [this]() {
-        proxyModel->selectedSection = ui->quickFilterView->comboBox()->currentData().toString();
-        proxyModel->setFilterRegExp(proxyModel->filterRegExp());
+        proxyModel->setSelectedSection(ui->quickFilterView->comboBox()->currentData().toString());
         tree->showItemsNumber(proxyModel->rowCount());
     });
 
@@ -237,7 +247,7 @@ void StringsWidget::refreshSectionCombo()
         combo->addItem(section, section);
     }
 
-    proxyModel->selectedSection.clear();
+    proxyModel->setSelectedSection(QString());
 }
 
 void StringsWidget::stringSearchFinished(const QList<StringDescription> &strings)
diff --git a/src/widgets/StringsWidget.h b/src/widgets/StringsWidget.h
index 15a5ce0f..e566cb0c 100644
--- a/src/widgets/StringsWidget.h
+++ b/src/widgets/StringsWidget.h
@@ -59,10 +59,9 @@ class StringsProxyModel : public AddressableFilterProxyModel
 {
     Q_OBJECT
 
-    friend StringsWidget;
-
 public:
     StringsProxyModel(StringsModel *sourceModel, QObject *parent = nullptr);
+    void setSelectedSection(QString section);
 
 protected:
     bool filterAcceptsRow(int row, const QModelIndex &parent) const override;
diff --git a/src/widgets/SymbolsWidget.cpp b/src/widgets/SymbolsWidget.cpp
index ff9625ec..0a19a473 100644
--- a/src/widgets/SymbolsWidget.cpp
+++ b/src/widgets/SymbolsWidget.cpp
@@ -94,7 +94,7 @@ bool SymbolsProxyModel::filterAcceptsRow(int row, const QModelIndex &parent) con
     QModelIndex index = sourceModel()->index(row, 0, parent);
     auto symbol = index.data(SymbolsModel::SymbolDescriptionRole).value<SymbolDescription>();
 
-    return symbol.name.contains(filterRegExp());
+    return qhelpers::filterStringContains(symbol.name, this);
 }
 
 bool SymbolsProxyModel::lessThan(const QModelIndex &left, const QModelIndex &right) const
diff --git a/src/widgets/ThreadsWidget.cpp b/src/widgets/ThreadsWidget.cpp
index ddb9f8f0..b650e7a6 100644
--- a/src/widgets/ThreadsWidget.cpp
+++ b/src/widgets/ThreadsWidget.cpp
@@ -174,7 +174,7 @@ bool ThreadsFilterModel::filterAcceptsRow(int row, const QModelIndex &parent) co
     // All columns are checked for a match
     for (int i = COLUMN_PID; i <= COLUMN_PATH; ++i) {
         QModelIndex index = sourceModel()->index(row, i, parent);
-        if (sourceModel()->data(index).toString().contains(filterRegExp())) {
+        if (qhelpers::filterStringContains(sourceModel()->data(index).toString(), this)) {
             return true;
         }
     }
diff --git a/src/widgets/TypesWidget.cpp b/src/widgets/TypesWidget.cpp
index 925252d6..91cf9551 100644
--- a/src/widgets/TypesWidget.cpp
+++ b/src/widgets/TypesWidget.cpp
@@ -91,15 +91,24 @@ TypesSortFilterProxyModel::TypesSortFilterProxyModel(TypesModel *source_model, Q
     setSourceModel(source_model);
 }
 
+void TypesSortFilterProxyModel::setCategory(QString category)
+{
+    selectedCategory = category;
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
+    invalidateFilter();
+#else
+    invalidateRowsFilter();
+#endif
+}
+
 bool TypesSortFilterProxyModel::filterAcceptsRow(int row, const QModelIndex &parent) const
 {
     QModelIndex index = sourceModel()->index(row, 0, parent);
     TypeDescription exp = index.data(TypesModel::TypeDescriptionRole).value<TypeDescription>();
-    if (selectedCategory.isEmpty()) {
-        return exp.type.contains(filterRegExp());
-    } else {
-        return selectedCategory == exp.category && exp.type.contains(filterRegExp());
+    if (!selectedCategory.isEmpty() && selectedCategory != exp.category) {
+        return false;
     }
+    return qhelpers::filterStringContains(exp.type, this);
 }
 
 bool TypesSortFilterProxyModel::lessThan(const QModelIndex &left, const QModelIndex &right) const
@@ -169,9 +178,7 @@ TypesWidget::TypesWidget(MainWindow *main)
     connect(Core(), &CutterCore::refreshAll, this, &TypesWidget::refreshTypes);
 
     connect(ui->quickFilterView->comboBox(), &QComboBox::currentTextChanged, this, [this]() {
-        types_proxy_model->selectedCategory =
-                ui->quickFilterView->comboBox()->currentData().toString();
-        types_proxy_model->setFilterRegExp(types_proxy_model->filterRegExp());
+        types_proxy_model->setCategory(ui->quickFilterView->comboBox()->currentData().toString());
         tree->showItemsNumber(types_proxy_model->rowCount());
     });
 
@@ -213,7 +220,7 @@ void TypesWidget::refreshCategoryCombo(const QStringList &categories)
         combo->addItem(category, category);
     }
 
-    types_proxy_model->selectedCategory.clear();
+    types_proxy_model->setCategory(QString());
 }
 
 void TypesWidget::setScrollMode()
diff --git a/src/widgets/TypesWidget.h b/src/widgets/TypesWidget.h
index 9372dd27..ddddeb09 100644
--- a/src/widgets/TypesWidget.h
+++ b/src/widgets/TypesWidget.h
@@ -50,10 +50,9 @@ class TypesSortFilterProxyModel : public QSortFilterProxyModel
 {
     Q_OBJECT
 
-    friend TypesWidget;
-
 public:
     TypesSortFilterProxyModel(TypesModel *source_model, QObject *parent = nullptr);
+    void setCategory(QString category);
 
 protected:
     bool filterAcceptsRow(int row, const QModelIndex &parent) const override;
diff --git a/src/widgets/ZignaturesWidget.cpp b/src/widgets/ZignaturesWidget.cpp
index d9c61760..a1b2167a 100644
--- a/src/widgets/ZignaturesWidget.cpp
+++ b/src/widgets/ZignaturesWidget.cpp
@@ -87,7 +87,7 @@ bool ZignaturesProxyModel::filterAcceptsRow(int row, const QModelIndex &parent)
     QModelIndex index = sourceModel()->index(row, 0, parent);
     ZignatureDescription item =
             index.data(ZignaturesModel::ZignatureDescriptionRole).value<ZignatureDescription>();
-    return item.name.contains(filterRegExp());
+    return qhelpers::filterStringContains(item.name, this);
 }
 
 bool ZignaturesProxyModel::lessThan(const QModelIndex &left, const QModelIndex &right) const