diff --git a/src/plugins/bazaar/annotationhighlighter.cpp b/src/plugins/bazaar/annotationhighlighter.cpp
index 5980470a6f0..2fcebe0b1f5 100644
--- a/src/plugins/bazaar/annotationhighlighter.cpp
+++ b/src/plugins/bazaar/annotationhighlighter.cpp
@@ -26,6 +26,8 @@
 #include "annotationhighlighter.h"
 #include "constants.h"
 
+#include <QRegularExpression>
+
 using namespace Bazaar::Internal;
 using namespace Bazaar;
 
@@ -37,7 +39,8 @@ BazaarAnnotationHighlighter::BazaarAnnotationHighlighter(const ChangeNumbers &ch
 
 QString BazaarAnnotationHighlighter::changeNumber(const QString &block) const
 {
-    if (m_changeset.indexIn(block) != -1)
-        return m_changeset.cap(1);
+    const QRegularExpressionMatch match = m_changeset.match(block);
+    if (match.hasMatch())
+        return match.captured(1);
     return QString();
 }
diff --git a/src/plugins/bazaar/annotationhighlighter.h b/src/plugins/bazaar/annotationhighlighter.h
index 442f3defa93..7e16bbf0cd8 100644
--- a/src/plugins/bazaar/annotationhighlighter.h
+++ b/src/plugins/bazaar/annotationhighlighter.h
@@ -26,7 +26,7 @@
 #pragma once
 
 #include <vcsbase/baseannotationhighlighter.h>
-#include <QRegExp>
+#include <QRegularExpression>
 
 namespace Bazaar {
 namespace Internal {
@@ -39,7 +39,7 @@ public:
 
 private:
     QString changeNumber(const QString &block) const override;
-    mutable QRegExp m_changeset;
+    const QRegularExpression m_changeset;
 };
 
 } // namespace Internal
diff --git a/src/plugins/bazaar/bazaarclient.cpp b/src/plugins/bazaar/bazaarclient.cpp
index 6fca62d459f..503eb4db886 100644
--- a/src/plugins/bazaar/bazaarclient.cpp
+++ b/src/plugins/bazaar/bazaarclient.cpp
@@ -36,7 +36,7 @@
 
 #include <QDir>
 #include <QFileInfo>
-#include <QRegExp>
+#include <QRegularExpression>
 #include <QTextStream>
 #include <QDebug>
 
@@ -123,14 +123,18 @@ BranchInfo BazaarClient::synchronousBranchQuery(const QString &repositoryRoot) c
     QTextStream ts(&branchConfFile);
     QString branchLocation;
     QString isBranchBound;
-    QRegExp branchLocationRx(QLatin1String("bound_location\\s*=\\s*(.+)$"));
-    QRegExp isBranchBoundRx(QLatin1String("bound\\s*=\\s*(.+)$"));
+    QRegularExpression branchLocationRx("bound_location\\s*=\\s*(.+)$");
+    QRegularExpression isBranchBoundRx("bound\\s*=\\s*(.+)$");
     while (!ts.atEnd() && (branchLocation.isEmpty() || isBranchBound.isEmpty())) {
         const QString line = ts.readLine();
-        if (branchLocationRx.indexIn(line) != -1)
-            branchLocation = branchLocationRx.cap(1);
-        else if (isBranchBoundRx.indexIn(line) != -1)
-            isBranchBound = isBranchBoundRx.cap(1);
+        QRegularExpressionMatch match = branchLocationRx.match(line);
+        if (match.hasMatch()) {
+            branchLocation = match.captured(1);
+        } else {
+            QRegularExpressionMatch match = isBranchBoundRx.match(line);
+            if (match.hasMatch())
+                isBranchBound = match.captured(1);
+        }
     }
     if (isBranchBound.simplified().toLower() == QLatin1String("true"))
         return BranchInfo(branchLocation, true);
diff --git a/src/plugins/bazaar/bazaarcommitwidget.cpp b/src/plugins/bazaar/bazaarcommitwidget.cpp
index 23861568cea..c2f0da6bd9a 100644
--- a/src/plugins/bazaar/bazaarcommitwidget.cpp
+++ b/src/plugins/bazaar/bazaarcommitwidget.cpp
@@ -35,7 +35,7 @@
 #include <QTextEdit>
 
 #include <QDebug>
-#include <QRegExp>
+#include <QRegularExpression>
 
 //see the git submit widget for details of the syntax Highlighter
 
@@ -62,7 +62,7 @@ public:
 private:
     enum State { Header, Comment, Other };
     const QTextCharFormat m_commentFormat;
-    QRegExp m_keywordPattern;
+    QRegularExpression m_keywordPattern;
     const QChar m_hashChar;
 };
 
@@ -97,15 +97,17 @@ void BazaarSubmitHighlighter::highlightBlock(const QString &text)
     case Comment:
         setFormat(0, text.size(), m_commentFormat);
         break;
-    case Other:
+    case Other: {
         // Format key words ("Task:") italic
-        if (m_keywordPattern.indexIn(text, 0, QRegExp::CaretAtZero) == 0) {
+        const QRegularExpressionMatch match = m_keywordPattern.match(text);
+        if (match.hasMatch()) {
             QTextCharFormat charFormat = format(0);
             charFormat.setFontItalic(true);
-            setFormat(0, m_keywordPattern.matchedLength(), charFormat);
+            setFormat(0, match.capturedLength(), charFormat);
         }
         break;
     }
+    }
 }
 
 
@@ -143,7 +145,7 @@ QString BazaarCommitWidget::committer() const
 
 QStringList BazaarCommitWidget::fixedBugs() const
 {
-    return m_bazaarCommitPanelUi.fixedBugsLineEdit->text().split(QRegExp(QLatin1String("\\s+")));
+    return m_bazaarCommitPanelUi.fixedBugsLineEdit->text().split(QRegularExpression("\\s+"));
 }
 
 bool BazaarCommitWidget::isLocalOptionEnabled() const
diff --git a/src/plugins/bazaar/bazaareditor.cpp b/src/plugins/bazaar/bazaareditor.cpp
index ac811b16aa0..9bb05329f8b 100644
--- a/src/plugins/bazaar/bazaareditor.cpp
+++ b/src/plugins/bazaar/bazaareditor.cpp
@@ -62,16 +62,16 @@ QString BazaarEditorWidget::changeUnderCursor(const QTextCursor &cursorIn) const
     cursor.select(QTextCursor::LineUnderCursor);
     if (cursor.hasSelection()) {
         const QString line = cursor.selectedText();
-        const int start = m_changesetId.indexIn(line);
-        if (start > -1) {
-            const QString match = m_changesetId.cap(0);
-            const int stop = start + match.length();
+        const QRegularExpressionMatch match = m_changesetId.match(line);
+        if (match.hasMatch()) {
+            const int start = match.capturedStart();
+            const int stop = match.capturedEnd();
             if (start <= cursorCol && cursorCol <= stop) {
                 cursor = cursorIn;
                 cursor.select(QTextCursor::WordUnderCursor);
                 if (cursor.hasSelection()) {
                     const QString change = cursor.selectedText();
-                    if (m_exactChangesetId.exactMatch(change))
+                    if (m_exactChangesetId.match(change).hasMatch())
                         return change;
                 }
             }
diff --git a/src/plugins/bazaar/bazaareditor.h b/src/plugins/bazaar/bazaareditor.h
index 96a9f1610f9..5421ec5cf46 100644
--- a/src/plugins/bazaar/bazaareditor.h
+++ b/src/plugins/bazaar/bazaareditor.h
@@ -27,7 +27,7 @@
 
 #include <vcsbase/vcsbaseeditor.h>
 
-#include <QRegExp>
+#include <QRegularExpression>
 
 namespace Bazaar {
 namespace Internal {
@@ -44,8 +44,8 @@ private:
     VcsBase::BaseAnnotationHighlighter *createAnnotationHighlighter(
             const QSet<QString> &changes) const override;
 
-    mutable QRegExp m_changesetId;
-    mutable QRegExp m_exactChangesetId;
+    const QRegularExpression m_changesetId;
+    const QRegularExpression m_exactChangesetId;
 };
 
 } // namespace Internal
diff --git a/src/plugins/bazaar/constants.h b/src/plugins/bazaar/constants.h
index f64c0eb27f7..4b6b6b66639 100644
--- a/src/plugins/bazaar/constants.h
+++ b/src/plugins/bazaar/constants.h
@@ -41,7 +41,7 @@ const char CHANGESET_ID[] = "^("
                             "| +[.0-9]+"     // short
                             "|[.0-9]+: "     // line
                             ")";
-const char CHANGESET_ID_EXACT[] = "([.0-9]+)";
+const char CHANGESET_ID_EXACT[] = "^([.0-9]+)$";
 const char ANNOTATE_CHANGESET_ID[] = "([.0-9]+)";
 
 // Base editor parameters