diff --git a/tests/qt_modeltest/tst_modeltest.cpp b/tests/qt_modeltest/tst_modeltest.cpp
index 78a8e040c2f..76bddaf21cc 100644
--- a/tests/qt_modeltest/tst_modeltest.cpp
+++ b/tests/qt_modeltest/tst_modeltest.cpp
@@ -52,6 +52,7 @@
 #include <QTreeWidget>
 #include <QTreeWidgetItem>
 #include <QStandardItemModel>
+#include <QRegularExpression>
 
 #include "modeltest.h"
 #include "dynamictreemodel.h"
@@ -116,7 +117,7 @@ void tst_ModelTest::stringListModel()
   model.setStringList( QStringList() << "a" << "e" << "plop" << "b" << "c" );
 
   proxy.setDynamicSortFilter( true );
-  proxy.setFilterRegExp( QRegExp( "[^b]" ) );
+  proxy.setFilterRegularExpression( QRegularExpression( "[^b]" ) );
 }
 
 void tst_ModelTest::treeWidgetModel()
diff --git a/tests/src/app/testqgisappclipboard.cpp b/tests/src/app/testqgisappclipboard.cpp
index 706d714957e..977523d7bb4 100644
--- a/tests/src/app/testqgisappclipboard.cpp
+++ b/tests/src/app/testqgisappclipboard.cpp
@@ -19,6 +19,7 @@
 #include <QSplashScreen>
 #include <QString>
 #include <QStringList>
+#include <QRegularExpression>
 
 #include "qgisapp.h"
 #include "qgsapplication.h"
@@ -179,9 +180,9 @@ void TestQgisAppClipboard::copyToText()
 
   // just test coordinates as integers - that's enough to verify that reprojection has occurred
   // and helps avoid rounding issues
-  QRegExp regex( "\\[([-\\d.]+),([-\\d.]+)\\]" );
-  ( void )regex.indexIn( result );
-  QStringList list = regex.capturedTexts();
+  QRegularExpression regex( "\\[([-\\d.]+),([-\\d.]+)\\]" );
+  QRegularExpressionMatch  match = regex.match( result );
+  QStringList list = match.capturedTexts();
   QCOMPARE( list.count(), 3 );
 
   int x = std::round( list.at( 1 ).toDouble() );
diff --git a/tests/src/core/testqgsogcutils.cpp b/tests/src/core/testqgsogcutils.cpp
index cc7fd100411..a0b352da6c1 100644
--- a/tests/src/core/testqgsogcutils.cpp
+++ b/tests/src/core/testqgsogcutils.cpp
@@ -23,6 +23,8 @@
 #include "qgsapplication.h"
 #include "qgsvectorlayer.h"
 
+#include <QRegularExpression>
+
 /**
  * \ingroup UnitTests
  * This is a unit test for OGC utilities
@@ -103,9 +105,9 @@ void TestQgsOgcUtils::testGeometryFromGML()
 static bool compareElements( QDomElement &element1, QDomElement &element2 )
 {
   QString tag1 = element1.tagName();
-  tag1.replace( QRegExp( ".*:" ), QString() );
+  tag1.replace( QRegularExpression( ".*:" ), QString() );
   QString tag2 = element2.tagName();
-  tag2.replace( QRegExp( ".*:" ), QString() );
+  tag2.replace( QRegularExpression( ".*:" ), QString() );
   if ( tag1 != tag2 )
   {
     qDebug( "Different tag names: %s, %s", tag1.toLatin1().data(), tag2.toLatin1().data() );
diff --git a/tests/src/providers/testqgswcspublicservers.cpp b/tests/src/providers/testqgswcspublicservers.cpp
index db4f6415a26..620b93db808 100644
--- a/tests/src/providers/testqgswcspublicservers.cpp
+++ b/tests/src/providers/testqgswcspublicservers.cpp
@@ -21,6 +21,7 @@
 #include <QString>
 #include <QStringList>
 #include <QTextStream>
+#include <QRegularExpression>
 
 #include "qgsapplication.h"
 #include "qgsdatasourceuri.h"
@@ -272,8 +273,8 @@ void TestQgsWcsPublicServers::test()
     QStringList myServerLog;
     myServerLog << "server:" + serverUrl;
     QString myServerDirName = serverUrl;
-    myServerDirName.replace( QRegExp( "[:/]+" ), QStringLiteral( "." ) );
-    myServerDirName.remove( QRegExp( "\\.$" ) );
+    myServerDirName.replace( QRegularExpression( "[:/]+" ), QStringLiteral( "." ) );
+    myServerDirName.remove( QRegularExpression( "\\.$" ) );
     QgsDebugMsg( "myServerDirName = " + myServerDirName );
 
     QDir myServerDir( mCacheDir.absolutePath() + '/' + myServerDirName );