diff --git a/src/libs/qmljs/qmljscheck.cpp b/src/libs/qmljs/qmljscheck.cpp
index b90236e026b..6527718c57c 100644
--- a/src/libs/qmljs/qmljscheck.cpp
+++ b/src/libs/qmljs/qmljscheck.cpp
@@ -34,7 +34,7 @@
 
 #include <QColor>
 #include <QDir>
-#include <QRegExp>
+#include <QRegularExpression>
 
 using namespace QmlJS;
 using namespace QmlJS::AST;
@@ -907,7 +907,7 @@ static bool checkTopLevelBindingForParentReference(ExpressionStatement *expStmt,
     SourceLocation location = locationFromRange(expStmt->firstSourceLocation(), expStmt->lastSourceLocation());
     QString stmtSource = source.mid(int(location.begin()), int(location.length));
 
-    if (stmtSource.contains(QRegExp("(^|\\W)parent\\.")))
+    if (stmtSource.contains(QRegularExpression("(^|\\W)parent\\.")))
         return true;
 
     return false;
@@ -1562,7 +1562,7 @@ void Check::addMessage(StaticAnalysis::Type type, const SourceLocation &location
 void Check::scanCommentsForAnnotations()
 {
     m_disabledMessageTypesByLine.clear();
-    QRegExp disableCommentPattern(Message::suppressionPattern());
+    const QRegularExpression disableCommentPattern = Message::suppressionPattern();
 
     foreach (const SourceLocation &commentLoc, _doc->engine()->comments()) {
         const QString &comment = _doc->source().mid(int(commentLoc.begin()), int(commentLoc.length));
@@ -1575,14 +1575,15 @@ void Check::scanCommentsForAnnotations()
         int lastOffset = -1;
         QList<MessageTypeAndSuppression> disabledMessageTypes;
         forever {
-            lastOffset = disableCommentPattern.indexIn(comment, lastOffset + 1);
-            if (lastOffset == -1)
+            const QRegularExpressionMatch match = disableCommentPattern.match(comment, lastOffset + 1);
+            if (!match.hasMatch())
                 break;
+            lastOffset = match.capturedStart();
             MessageTypeAndSuppression entry;
-            entry.type = static_cast<StaticAnalysis::Type>(disableCommentPattern.cap(1).toInt());
+            entry.type = static_cast<StaticAnalysis::Type>(match.captured(1).toInt());
             entry.wasSuppressed = false;
             entry.suppressionSource = SourceLocation(commentLoc.offset + quint32(lastOffset),
-                                                     quint32(disableCommentPattern.matchedLength()),
+                                                     quint32(match.capturedLength()),
                                                      commentLoc.startLine,
                                                      commentLoc.startColumn + quint32(lastOffset));
             disabledMessageTypes += entry;
diff --git a/src/libs/qmljs/qmljsimportdependencies.cpp b/src/libs/qmljs/qmljsimportdependencies.cpp
index a438b93a738..d5242af3aa7 100644
--- a/src/libs/qmljs/qmljsimportdependencies.cpp
+++ b/src/libs/qmljs/qmljsimportdependencies.cpp
@@ -147,8 +147,7 @@ ImportKey::ImportKey(const ImportInfo &info)
     , majorVersion(info.version().majorVersion())
     , minorVersion(info.version().minorVersion())
 {
-    splitPath = QFileInfo(info.path()).canonicalFilePath().split(QLatin1Char('/'),
-                                                                 QString::KeepEmptyParts);
+    splitPath = QFileInfo(info.path()).canonicalFilePath().split('/');
 }
 
 ImportKey::ImportKey(ImportType::Enum type, const QString &path, int majorVersion, int minorVersion)
diff --git a/src/libs/qmljs/qmljslineinfo.cpp b/src/libs/qmljs/qmljslineinfo.cpp
index 9a7ab32e251..430f37031cf 100644
--- a/src/libs/qmljs/qmljslineinfo.cpp
+++ b/src/libs/qmljs/qmljslineinfo.cpp
@@ -78,7 +78,7 @@ const int LineInfo::SmallRoof = 40;
 const int LineInfo::BigRoof = 400;
 
 LineInfo::LineInfo()
-    : braceX(QRegExp(QLatin1String("^\\s*\\}\\s*(?:else|catch)\\b")))
+    : braceX(QRegularExpression("^\\s*\\}\\s*(?:else|catch)\\b"))
 {
     /*
         The "linizer" is a group of functions and variables to iterate
diff --git a/src/libs/qmljs/qmljslineinfo.h b/src/libs/qmljs/qmljslineinfo.h
index 1646ba64f3d..5d3a0816a6e 100644
--- a/src/libs/qmljs/qmljslineinfo.h
+++ b/src/libs/qmljs/qmljslineinfo.h
@@ -27,7 +27,7 @@
 
 #include <qmljs/qmljs_global.h>
 
-#include <QRegExp>
+#include <QRegularExpression>
 #include <QTextBlock>
 
 namespace QmlJS {
@@ -112,7 +112,7 @@ protected:
     const int *yyBraceDepth;
     const bool *yyLeftBraceFollows;
 
-    QRegExp braceX;
+    QRegularExpression braceX;
 };
 
 } // namespace QmlJS
diff --git a/src/libs/qmljs/qmljsmodelmanagerinterface.cpp b/src/libs/qmljs/qmljsmodelmanagerinterface.cpp
index 402128d272d..9189ea7e3c7 100644
--- a/src/libs/qmljs/qmljsmodelmanagerinterface.cpp
+++ b/src/libs/qmljs/qmljsmodelmanagerinterface.cpp
@@ -38,6 +38,7 @@
 #include <utils/algorithm.h>
 #include <utils/hostosinfo.h>
 #include <utils/runextensions.h>
+#include <utils/stringutils.h>
 
 #include <QDir>
 #include <QDirIterator>
@@ -90,7 +91,7 @@ static QStringList environmentImportPaths()
     QStringList paths;
 
     const QStringList importPaths = QString::fromLocal8Bit(qgetenv("QML_IMPORT_PATH")).split(
-        Utils::HostOsInfo::pathListSeparator(), QString::SkipEmptyParts);
+        Utils::HostOsInfo::pathListSeparator(), Utils::SkipEmptyParts);
 
     for (const QString &path : importPaths) {
         const QString canonicalPath = QDir(path).canonicalPath();
@@ -267,8 +268,10 @@ void ModelManagerInterface::loadQmlTypeDescriptionsInternal(const QString &resou
     }
 
     // load the fallbacks for libraries
-    CppQmlTypesLoader::defaultLibraryObjects.unite(
-                CppQmlTypesLoader::loadQmlTypes(qmlTypesFiles, &errors, &warnings));
+    const CppQmlTypesLoader::BuiltinObjects objs =
+            CppQmlTypesLoader::loadQmlTypes(qmlTypesFiles, &errors, &warnings);
+    for (auto it = objs.cbegin(); it != objs.cend(); ++it)
+        CppQmlTypesLoader::defaultLibraryObjects.insert(it.key(), it.value());
 
     for (const QString &error : qAsConst(errors))
         writeMessageInternal(error);
diff --git a/src/libs/qmljs/qmljsstaticanalysismessage.cpp b/src/libs/qmljs/qmljsstaticanalysismessage.cpp
index 10f918abe47..b6a3e97ddbd 100644
--- a/src/libs/qmljs/qmljsstaticanalysismessage.cpp
+++ b/src/libs/qmljs/qmljsstaticanalysismessage.cpp
@@ -31,7 +31,7 @@
 #include <utils/qtcassert.h>
 
 #include <QCoreApplication>
-#include <QRegExp>
+#include <QRegularExpression>
 
 using namespace QmlJS;
 using namespace QmlJS::StaticAnalysis;
@@ -317,9 +317,9 @@ QString Message::suppressionString() const
     return QString::fromLatin1("@disable-check M%1").arg(QString::number(type));
 }
 
-QRegExp Message::suppressionPattern()
+QRegularExpression Message::suppressionPattern()
 {
-    return QRegExp(QLatin1String("@disable-check M(\\d+)"));
+    return QRegularExpression("@disable-check M(\\d+)");
 }
 
 const PrototypeMessageData Message::prototypeForMessageType(Type type)
diff --git a/src/libs/qmljs/qmljsstaticanalysismessage.h b/src/libs/qmljs/qmljsstaticanalysismessage.h
index 64a8baa4e00..27e37a3c605 100644
--- a/src/libs/qmljs/qmljsstaticanalysismessage.h
+++ b/src/libs/qmljs/qmljsstaticanalysismessage.h
@@ -32,7 +32,7 @@
 #include <QString>
 #include <QList>
 
-QT_FORWARD_DECLARE_CLASS(QRegExp)
+QT_FORWARD_DECLARE_CLASS(QRegularExpression)
 
 namespace QmlJS {
 class DiagnosticMessage;
@@ -157,7 +157,7 @@ public:
     DiagnosticMessage toDiagnosticMessage() const;
 
     QString suppressionString() const;
-    static QRegExp suppressionPattern();
+    static QRegularExpression suppressionPattern();
 
     SourceLocation location;
     QString message;
diff --git a/src/libs/qmljs/qmljsutils.cpp b/src/libs/qmljs/qmljsutils.cpp
index ba48ef1f076..031829c4479 100644
--- a/src/libs/qmljs/qmljsutils.cpp
+++ b/src/libs/qmljs/qmljsutils.cpp
@@ -27,6 +27,8 @@
 
 #include "parser/qmljsast_p.h"
 
+#include <utils/stringutils.h>
+
 #include <QColor>
 #include <QDir>
 #include <QRegularExpression>
@@ -239,7 +241,7 @@ QString QmlJS::modulePath(const QString &name, const QString &version,
         return QString();
 
     const QString sanitizedVersion = version == undefinedVersion ? QString() : version;
-    const QStringList parts = name.split(QLatin1Char('.'), QString::SkipEmptyParts);
+    const QStringList parts = name.split('.', Utils::SkipEmptyParts);
     auto mkpath = [] (const QStringList &xs) -> QString { return xs.join(QLatin1Char('/')); };
 
     // Regular expression for building candidates by successively removing minor and major