diff --git a/src/corelib/global/qnamespace.h b/src/corelib/global/qnamespace.h
index 8851e08d4fc..ffc3989815e 100644
--- a/src/corelib/global/qnamespace.h
+++ b/src/corelib/global/qnamespace.h
@@ -1560,12 +1560,12 @@ namespace Qt {
         MatchContains = 1,
         MatchStartsWith = 2,
         MatchEndsWith = 3,
+        MatchRegularExpression = 4,
 #if QT_DEPRECATED_SINCE(5, 15)
-        MatchRegExp Q_DECL_ENUMERATOR_DEPRECATED_X("MatchRegExp is deprecated. Use MatchRegularExpression instead") = 4,
+        MatchRegExp Q_DECL_ENUMERATOR_DEPRECATED_X("MatchRegExp is deprecated. Use MatchRegularExpression instead") = MatchRegularExpression,
 #endif
         MatchWildcard = 5,
         MatchFixedString = 8,
-        MatchRegularExpression = 9,
         MatchCaseSensitive = 16,
         MatchWrap = 32,
         MatchRecursive = 64
diff --git a/src/corelib/global/qnamespace.qdoc b/src/corelib/global/qnamespace.qdoc
index 3e22c9e661d..cff2fab398b 100644
--- a/src/corelib/global/qnamespace.qdoc
+++ b/src/corelib/global/qnamespace.qdoc
@@ -2875,8 +2875,7 @@
     \value MatchStartsWith         The search term matches the start of the item.
     \value MatchEndsWith           The search term matches the end of the item.
     \value MatchCaseSensitive      The search is case sensitive.
-    \value MatchRegExp             Performs string-based matching using a regular
-           expression as the search term. Uses the deprecated QRegExp class.
+    \value MatchRegExp             Same as MatchRegularExpression
            \e{This enum value is deprecated since Qt 5.15.}
     \value MatchRegularExpression  Performs string-based matching using a regular
            expression as the search term. Uses QRegularExpression.
diff --git a/src/corelib/itemmodels/qabstractitemmodel.cpp b/src/corelib/itemmodels/qabstractitemmodel.cpp
index 41bdaa2ac57..57a6c2f2393 100644
--- a/src/corelib/itemmodels/qabstractitemmodel.cpp
+++ b/src/corelib/itemmodels/qabstractitemmodel.cpp
@@ -2408,13 +2408,6 @@ QModelIndexList QAbstractItemModel::match(const QModelIndex &start, int role,
 
                 QString t = v.toString();
                 switch (matchType) {
-#if QT_DEPRECATED_SINCE(5, 15)
-                case Qt::MatchRegExp:
-                    if (QRegExp(text, cs).exactMatch(t))
-                        result.append(idx);
-                    break;
-#endif
-
 #if QT_CONFIG(regularexpression)
                 case Qt::MatchRegularExpression:
                     Q_FALLTHROUGH();
diff --git a/src/widgets/util/qcompleter.cpp b/src/widgets/util/qcompleter.cpp
index 72fa5577907..c02649f20ca 100644
--- a/src/widgets/util/qcompleter.cpp
+++ b/src/widgets/util/qcompleter.cpp
@@ -757,7 +757,7 @@ int QUnsortedModelEngine::buildIndices(const QString& str, const QModelIndex& pa
         case Qt::MatchExactly:
         case Qt::MatchFixedString:
         case Qt::MatchCaseSensitive:
-        case Qt::MatchRegExp:
+        case Qt::MatchRegularExpression:
         case Qt::MatchWildcard:
         case Qt::MatchWrap:
         case Qt::MatchRecursive:
diff --git a/tests/auto/corelib/itemmodels/qabstractitemmodel/tst_qabstractitemmodel.cpp b/tests/auto/corelib/itemmodels/qabstractitemmodel/tst_qabstractitemmodel.cpp
index 9fab36deaa8..20255b996ef 100644
--- a/tests/auto/corelib/itemmodels/qabstractitemmodel/tst_qabstractitemmodel.cpp
+++ b/tests/auto/corelib/itemmodels/qabstractitemmodel/tst_qabstractitemmodel.cpp
@@ -449,9 +449,9 @@ void tst_QAbstractItemModel::match()
     QCOMPARE(res.count(), 2);
     res = model.match(start, Qt::DisplayRole, QVariant("*a*"), -1, Qt::MatchWildcard);
     QCOMPARE(res.count(), 3);
-    res = model.match(start, Qt::DisplayRole, QVariant(".*O.*"), -1, Qt::MatchRegExp);
+    res = model.match(start, Qt::DisplayRole, QVariant(".*O.*"), -1, Qt::MatchRegularExpression);
     QCOMPARE(res.count(), 2);
-    res = model.match(start, Qt::DisplayRole, QVariant(".*O.*"), -1, Qt::MatchRegExp | Qt::MatchCaseSensitive);
+    res = model.match(start, Qt::DisplayRole, QVariant(".*O.*"), -1, Qt::MatchRegularExpression | Qt::MatchCaseSensitive);
     QCOMPARE(res.count(), 0);
     res = model.match(start, Qt::DisplayRole, QVariant("BOAR"), -1, Qt::MatchFixedString);
     QCOMPARE(res.count(), 1);