diff --git a/src/gui/kernel/qplatformdialoghelper.h b/src/gui/kernel/qplatformdialoghelper.h
index d1e627d506..5865e0a27d 100644
--- a/src/gui/kernel/qplatformdialoghelper.h
+++ b/src/gui/kernel/qplatformdialoghelper.h
@@ -291,6 +291,9 @@ public:
     const QSharedPointer<QFileDialogOptions> &options() const;
     void setOptions(const QSharedPointer<QFileDialogOptions> &options);
 
+    static QStringList cleanFilterList(const QString &filter);
+    static const char *filterRegExp;
+
 Q_SIGNALS:
     void fileSelected(const QString &file);
     void filesSelected(const QStringList &files);
diff --git a/src/gui/kernel/qplatformdialoghelper_qpa.cpp b/src/gui/kernel/qplatformdialoghelper_qpa.cpp
index f00437f69b..f71c5e58de 100644
--- a/src/gui/kernel/qplatformdialoghelper_qpa.cpp
+++ b/src/gui/kernel/qplatformdialoghelper_qpa.cpp
@@ -577,4 +577,18 @@ void QPlatformFileDialogHelper::setOptions(const QSharedPointer<QFileDialogOptio
     m_options = options;
 }
 
+const char *QPlatformFileDialogHelper::filterRegExp =
+"^(.*)\\(([a-zA-Z0-9_.*? +;#\\-\\[\\]@\\{\\}/!<>\\$%&=^~:\\|]*)\\)$";
+
+// Makes a list of filters from a normal filter string "Image Files (*.png *.jpg)"
+QStringList QPlatformFileDialogHelper::cleanFilterList(const QString &filter)
+{
+    QRegExp regexp(QString::fromLatin1(filterRegExp));
+    QString f = filter;
+    int i = regexp.indexIn(f);
+    if (i >= 0)
+        f = regexp.cap(2);
+    return f.split(QLatin1Char(' '), QString::SkipEmptyParts);
+}
+
 QT_END_NAMESPACE
diff --git a/src/plugins/platforms/cocoa/qcocoafiledialoghelper.mm b/src/plugins/platforms/cocoa/qcocoafiledialoghelper.mm
index 30f4cabfae..05149a8098 100644
--- a/src/plugins/platforms/cocoa/qcocoafiledialoghelper.mm
+++ b/src/plugins/platforms/cocoa/qcocoafiledialoghelper.mm
@@ -444,7 +444,7 @@ typedef QSharedPointer<QFileDialogOptions> SharedPointerFileDialogOptions;
 
 - (QString)removeExtensions:(const QString &)filter
 {
-    QRegExp regExp(QT_PREPEND_NAMESPACE(QString::fromLatin1)(QT_PREPEND_NAMESPACE(QFileDialogPrivate::qt_file_dialog_filter_reg_exp)));
+    QRegExp regExp(QT_PREPEND_NAMESPACE(QString::fromLatin1)(QT_PREPEND_NAMESPACE(QPlatformFileDialogHelper::filterRegExp)));
     if (regExp.indexIn(filter) != -1)
         return regExp.cap(1).trimmed();
     return filter;
@@ -487,7 +487,7 @@ typedef QSharedPointer<QFileDialogOptions> SharedPointerFileDialogOptions;
 {
     for (int i=0; i<mNameFilterDropDownList->size(); ++i) {
         if (mNameFilterDropDownList->at(i).startsWith(name))
-            return QFileDialogPrivate::qt_clean_filter_list(mNameFilterDropDownList->at(i));
+            return QPlatformFileDialogHelper::cleanFilterList(mNameFilterDropDownList->at(i));
     }
     return QStringList();
 }
diff --git a/src/widgets/dialogs/qfiledialog.cpp b/src/widgets/dialogs/qfiledialog.cpp
index 18b98b50f3..5b49aec243 100644
--- a/src/widgets/dialogs/qfiledialog.cpp
+++ b/src/widgets/dialogs/qfiledialog.cpp
@@ -401,9 +401,6 @@ QList<QUrl> QFileDialog::sidebarUrls() const
 
 static const qint32 QFileDialogMagic = 0xbe;
 
-const char *QFileDialogPrivate::qt_file_dialog_filter_reg_exp =
-"^(.*)\\(([a-zA-Z0-9_.*? +;#\\-\\[\\]@\\{\\}/!<>\\$%&=^~:\\|]*)\\)$";
-
 /*!
     \since 4.3
     Saves the state of the dialog's layout, history and current directory.
@@ -1137,7 +1134,7 @@ bool QFileDialog::isNameFilterDetailsVisible() const
 QStringList qt_strip_filters(const QStringList &filters)
 {
     QStringList strippedFilters;
-    QRegExp r(QString::fromLatin1(QFileDialogPrivate::qt_file_dialog_filter_reg_exp));
+    QRegExp r(QString::fromLatin1(QPlatformFileDialogHelper::filterRegExp));
     for (int i = 0; i < filters.count(); ++i) {
         QString filterName;
         int index = r.indexIn(filters[i]);
@@ -2993,17 +2990,6 @@ void QFileDialogPrivate::_q_goToDirectory(const QString &path)
     }
 }
 
-// Makes a list of filters from a normal filter string "Image Files (*.png *.jpg)"
-QStringList QFileDialogPrivate::qt_clean_filter_list(const QString &filter)
-{
-    QRegExp regexp(QString::fromLatin1(qt_file_dialog_filter_reg_exp));
-    QString f = filter;
-    int i = regexp.indexIn(f);
-    if (i >= 0)
-        f = regexp.cap(2);
-    return f.split(QLatin1Char(' '), QString::SkipEmptyParts);
-}
-
 /*!
     \internal
 
@@ -3020,7 +3006,7 @@ void QFileDialogPrivate::_q_useNameFilter(int index)
     }
 
     QString nameFilter = nameFilters.at(index);
-    QStringList newNameFilters = qt_clean_filter_list(nameFilter);
+    QStringList newNameFilters = QPlatformFileDialogHelper::cleanFilterList(nameFilter);
     if (q_func()->acceptMode() == QFileDialog::AcceptSave) {
         QString newNameFilterExtension;
         if (newNameFilters.count() > 0)
diff --git a/src/widgets/dialogs/qfiledialog_p.h b/src/widgets/dialogs/qfiledialog_p.h
index d7b5ce6527..4760c615cd 100644
--- a/src/widgets/dialogs/qfiledialog_p.h
+++ b/src/widgets/dialogs/qfiledialog_p.h
@@ -211,9 +211,6 @@ public:
     void _q_rowsInserted(const QModelIndex & parent);
     void _q_fileRenamed(const QString &path, const QString oldName, const QString newName);
 
-    static QStringList qt_clean_filter_list(const QString &filter);
-    static const char *qt_file_dialog_filter_reg_exp;
-
     // layout
 #ifndef QT_NO_PROXYMODEL
     QAbstractProxyModel *proxyModel;