diff --git a/src/corelib/.prev_configure.cmake b/src/corelib/.prev_configure.cmake
index 9b69329c9b..63238845a0 100644
--- a/src/corelib/.prev_configure.cmake
+++ b/src/corelib/.prev_configure.cmake
@@ -782,7 +782,7 @@ qt_feature("sortfilterproxymodel" PUBLIC
     SECTION "ItemViews"
     LABEL "QSortFilterProxyModel"
     PURPOSE "Supports sorting and filtering of data passed between another model and a view."
-    CONDITION QT_FEATURE_proxymodel
+    CONDITION QT_FEATURE_proxymodel AND QT_FEATURE_regularexpression
 )
 qt_feature_definition("sortfilterproxymodel" "QT_NO_SORTFILTERPROXYMODEL" NEGATE VALUE "1")
 qt_feature("identityproxymodel" PUBLIC
diff --git a/src/corelib/configure.cmake b/src/corelib/configure.cmake
index 6dab11b5a5..0b272a6c70 100644
--- a/src/corelib/configure.cmake
+++ b/src/corelib/configure.cmake
@@ -788,7 +788,7 @@ qt_feature("sortfilterproxymodel" PUBLIC
     SECTION "ItemViews"
     LABEL "QSortFilterProxyModel"
     PURPOSE "Supports sorting and filtering of data passed between another model and a view."
-    CONDITION QT_FEATURE_proxymodel
+    CONDITION QT_FEATURE_proxymodel AND QT_FEATURE_regularexpression
 )
 qt_feature_definition("sortfilterproxymodel" "QT_NO_SORTFILTERPROXYMODEL" NEGATE VALUE "1")
 qt_feature("identityproxymodel" PUBLIC
diff --git a/src/corelib/configure.json b/src/corelib/configure.json
index 9c8615cf74..b1ba89cd39 100644
--- a/src/corelib/configure.json
+++ b/src/corelib/configure.json
@@ -898,7 +898,7 @@
             "label": "QSortFilterProxyModel",
             "purpose": "Supports sorting and filtering of data passed between another model and a view.",
             "section": "ItemViews",
-            "condition": "features.proxymodel",
+            "condition": "features.proxymodel && features.regularexpression",
             "output": [ "publicFeature", "feature" ]
         },
         "identityproxymodel": {
diff --git a/src/corelib/global/qconfig-bootstrapped.h b/src/corelib/global/qconfig-bootstrapped.h
index 4649395c5f..a3db9231a9 100644
--- a/src/corelib/global/qconfig-bootstrapped.h
+++ b/src/corelib/global/qconfig-bootstrapped.h
@@ -66,8 +66,6 @@
 #define QT_NO_USING_NAMESPACE
 #define QT_NO_DEPRECATED
 
-#define QT_NO_REGEXP
-
 // Keep feature-test macros in alphabetic order by feature name:
 #define QT_FEATURE_alloca 1
 #define QT_FEATURE_alloca_h -1
diff --git a/src/corelib/global/qt_pch.h b/src/corelib/global/qt_pch.h
index 8e59ace85d..58697517b5 100644
--- a/src/corelib/global/qt_pch.h
+++ b/src/corelib/global/qt_pch.h
@@ -69,7 +69,9 @@
 #include <qlist.h>
 #include <qvariant.h>  /* All moc genereated code has this include */
 #include <qobject.h>
-#include <qregularexpression.h>
+#if QT_CONFIG(regularexpression)
+#    include <qregularexpression.h>
+#endif
 #include <qscopedpointer.h>
 #include <qshareddata.h>
 #include <qstring.h>
diff --git a/src/corelib/itemmodels/qsortfilterproxymodel.cpp b/src/corelib/itemmodels/qsortfilterproxymodel.cpp
index 38417bbba6..398425c020 100644
--- a/src/corelib/itemmodels/qsortfilterproxymodel.cpp
+++ b/src/corelib/itemmodels/qsortfilterproxymodel.cpp
@@ -2484,7 +2484,6 @@ Qt::SortOrder QSortFilterProxyModel::sortOrder() const
     return d->sort_order;
 }
 
-#if QT_CONFIG(regularexpression)
 /*!
     \since 5.12
     \property QSortFilterProxyModel::filterRegularExpression
@@ -2512,7 +2511,6 @@ void QSortFilterProxyModel::setFilterRegularExpression(const QRegularExpression
     d->filter_data = regularExpression;
     d->filter_changed(QSortFilterProxyModelPrivate::Direction::Rows);
 }
-#endif
 
 /*!
     \property QSortFilterProxyModel::filterKeyColumn
@@ -2640,7 +2638,6 @@ void QSortFilterProxyModel::setSortLocaleAware(bool on)
     emit sortLocaleAwareChanged(on);
 }
 
-#if QT_CONFIG(regularexpression)
 /*!
     \since 5.12
 
@@ -2661,7 +2658,6 @@ void QSortFilterProxyModel::setFilterRegularExpression(const QString &pattern)
     d->filter_data.setPattern(pattern);
     d->filter_changed(QSortFilterProxyModelPrivate::Direction::Rows);
 }
-#endif
 
 /*!
     Sets the wildcard expression used to filter the contents
diff --git a/src/corelib/itemmodels/qsortfilterproxymodel.h b/src/corelib/itemmodels/qsortfilterproxymodel.h
index d2c5054351..026da9ecf7 100644
--- a/src/corelib/itemmodels/qsortfilterproxymodel.h
+++ b/src/corelib/itemmodels/qsortfilterproxymodel.h
@@ -42,9 +42,7 @@
 
 #include <QtCore/qabstractproxymodel.h>
 
-#if QT_CONFIG(regularexpression)
-# include <QtCore/qregularexpression.h>
-#endif
+#include <QtCore/qregularexpression.h>
 
 QT_REQUIRE_CONFIG(sortfilterproxymodel);
 
@@ -61,9 +59,7 @@ class Q_CORE_EXPORT QSortFilterProxyModel : public QAbstractProxyModel
     friend class QSortFilterProxyModelGreaterThan;
 
     Q_OBJECT
-#if QT_CONFIG(regularexpression)
     Q_PROPERTY(QRegularExpression filterRegularExpression READ filterRegularExpression WRITE setFilterRegularExpression)
-#endif
     Q_PROPERTY(int filterKeyColumn READ filterKeyColumn WRITE setFilterKeyColumn)
     Q_PROPERTY(bool dynamicSortFilter READ dynamicSortFilter WRITE setDynamicSortFilter)
     Q_PROPERTY(Qt::CaseSensitivity filterCaseSensitivity READ filterCaseSensitivity WRITE setFilterCaseSensitivity NOTIFY filterCaseSensitivityChanged)
@@ -86,9 +82,7 @@ public:
     QItemSelection mapSelectionToSource(const QItemSelection &proxySelection) const override;
     QItemSelection mapSelectionFromSource(const QItemSelection &sourceSelection) const override;
 
-#if QT_CONFIG(regularexpression)
     QRegularExpression filterRegularExpression() const;
-#endif
 
     int filterKeyColumn() const;
     void setFilterKeyColumn(int column);
@@ -121,10 +115,8 @@ public:
     void setAutoAcceptChildRows(bool accept);
 
 public Q_SLOTS:
-#if QT_CONFIG(regularexpression)
     void setFilterRegularExpression(const QString &pattern);
     void setFilterRegularExpression(const QRegularExpression &regularExpression);
-#endif
     void setFilterWildcard(const QString &pattern);
     void setFilterFixedString(const QString &pattern);
     void invalidate();
diff --git a/src/corelib/text/qstring.cpp b/src/corelib/text/qstring.cpp
index 390c10e1fc..24e725ee9a 100644
--- a/src/corelib/text/qstring.cpp
+++ b/src/corelib/text/qstring.cpp
@@ -4569,7 +4569,7 @@ QString QString::section(const QString &sep, qsizetype start, qsizetype end, Sec
     return ret;
 }
 
-#if !(defined(QT_NO_REGEXP) && !QT_CONFIG(regularexpression))
+#if QT_CONFIG(regularexpression)
 class qt_section_chunk {
 public:
     qt_section_chunk() {}
@@ -4637,9 +4637,7 @@ static QString extractSections(const QList<qt_section_chunk> &sections, qsizetyp
 
     return ret;
 }
-#endif
 
-#if QT_CONFIG(regularexpression)
 /*!
     \overload section()
     \since 5.0