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diff --git a/src/corelib/text/qstringmatcher.h b/src/corelib/text/qstringmatcher.h
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+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Copyright (C) 2019 Mail.ru Group.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QSTRINGMATCHER_H
+#define QSTRINGMATCHER_H
+
+#include <QtCore/qstring.h>
+#include <QtCore/qstringview.h>
+
+QT_BEGIN_NAMESPACE
+
+
+class QStringMatcherPrivate;
+
+class Q_CORE_EXPORT QStringMatcher
+{
+public:
+    QStringMatcher();
+    explicit QStringMatcher(const QString &pattern,
+                   Qt::CaseSensitivity cs = Qt::CaseSensitive);
+    QStringMatcher(const QChar *uc, int len,
+                   Qt::CaseSensitivity cs = Qt::CaseSensitive);
+    QStringMatcher(QStringView pattern,
+                   Qt::CaseSensitivity cs = Qt::CaseSensitive);
+    QStringMatcher(const QStringMatcher &other);
+    ~QStringMatcher();
+
+    QStringMatcher &operator=(const QStringMatcher &other);
+
+    void setPattern(const QString &pattern);
+    void setCaseSensitivity(Qt::CaseSensitivity cs);
+
+    int indexIn(const QString &str, int from = 0) const;
+    int indexIn(const QChar *str, int length, int from = 0) const;
+    qsizetype indexIn(QStringView str, qsizetype from = 0) const;
+    QString pattern() const;
+    inline Qt::CaseSensitivity caseSensitivity() const { return q_cs; }
+
+private:
+    QStringMatcherPrivate *d_ptr;
+    QString q_pattern;
+    Qt::CaseSensitivity q_cs;
+    struct Data {
+        uchar q_skiptable[256];
+        const QChar *uc;
+        int len;
+    };
+    union {
+        uint q_data[256];
+        Data p;
+    };
+};
+
+QT_END_NAMESPACE
+
+#endif // QSTRINGMATCHER_H