5 files changed, 108 insertions, 0 deletions
diff --git a/src/plugins/FileDialogs/QmmpFileDialog/qmmpfiledialogimpl.cpp b/src/plugins/FileDialogs/QmmpFileDialog/qmmpfiledialogimpl.cpp
index e54e35968..6f77459e0 100644
--- a/src/plugins/FileDialogs/QmmpFileDialog/qmmpfiledialogimpl.cpp
+++ b/src/plugins/FileDialogs/QmmpFileDialog/qmmpfiledialogimpl.cpp
@@ -448,7 +448,11 @@ void QmmpFileDialogImpl::addFiles(const QStringList &list)
         bool contains = false;
         for(const QString &str : qt_clean_filter_list(fileTypeComboBox->currentText()))
         {
+#if QT_VERSION >= QT_VERSION_CHECK(5, 12, 0)
             QRegularExpression regExp(QRegularExpression::wildcardToRegularExpression(str));
+#else
+            QRegularExpression regExp(Qmmp::wildcardToRegularExpression(str));
+#endif
             if (f_name.contains(regExp))
             {
                 contains = true;
diff --git a/src/plugins/FileDialogs/TwoPanelFileDialog/twopanelfiledialogimpl.cpp b/src/plugins/FileDialogs/TwoPanelFileDialog/twopanelfiledialogimpl.cpp
index 7d7b6c0cd..063f7bd21 100644
--- a/src/plugins/FileDialogs/TwoPanelFileDialog/twopanelfiledialogimpl.cpp
+++ b/src/plugins/FileDialogs/TwoPanelFileDialog/twopanelfiledialogimpl.cpp
@@ -431,7 +431,11 @@ void TwoPanelFileDialogImpl::addFiles(const QStringList &list, bool play)
         bool contains = false;
         for(const QString &str : qt_clean_filter_list(m_ui.fileTypeComboBox->currentText()))
         {
+#if QT_VERSION >= QT_VERSION_CHECK(5, 12, 0)
             QRegularExpression regExp(QRegularExpression::wildcardToRegularExpression(str));
+#else
+            QRegularExpression regExp(Qmmp::wildcardToRegularExpression(str));
+#endif
             if (f_name.contains(regExp))
             {
                 contains = true;
diff --git a/src/qmmp/qmmp.cpp b/src/qmmp/qmmp.cpp
index e6c1f9fa7..cc752bbf4 100644
--- a/src/qmmp/qmmp.cpp
+++ b/src/qmmp/qmmp.cpp
@@ -162,3 +162,94 @@ bool Qmmp::isPortable()
     return QFile::exists(m_appDir + "/qmmp_portable.txt");
 }
 #endif
+
+#if QT_VERSION < QT_VERSION_CHECK(5, 12, 0)
+QString Qmmp::wildcardToRegularExpression(const QString &pattern)
+{
+    const int wclen = pattern.length();
+    QString rx;
+    rx.reserve(wclen + wclen / 16);
+    int i = 0;
+    const QChar *wc = pattern.data();
+
+#ifdef Q_OS_WIN
+    const QLatin1Char nativePathSeparator('\\');
+    const QLatin1String starEscape("[^/\\\\]*");
+    const QLatin1String questionMarkEscape("[^/\\\\]");
+#else
+    const QLatin1Char nativePathSeparator('/');
+    const QLatin1String starEscape("[^/]*");
+    const QLatin1String questionMarkEscape("[^/]");
+#endif
+
+    while (i < wclen) {
+        const QChar c = wc[i++];
+        switch (c.unicode())
+        {
+        case '*':
+            rx += starEscape;
+            break;
+        case '?':
+            rx += questionMarkEscape;
+            break;
+        case '\\':
+#ifdef Q_OS_WIN
+        case '/':
+            rx += QLatin1String("[/\\\\]");
+            break;
+#endif
+        case '$':
+        case '(':
+        case ')':
+        case '+':
+        case '.':
+        case '^':
+        case '{':
+        case '|':
+        case '}':
+            rx += QLatin1Char('\\');
+            rx += c;
+            break;
+        case '[':
+            rx += c;
+            // Support for the [!abc] or [!a-c] syntax
+            if (i < wclen) {
+                if (wc[i] == QLatin1Char('!'))
+                {
+                    rx += QLatin1Char('^');
+                    ++i;
+                }
+
+                if (i < wclen && wc[i] == QLatin1Char(']'))
+                    rx += wc[i++];
+
+                while (i < wclen && wc[i] != QLatin1Char(']'))
+                {
+                    // The '/' appearing in a character class invalidates the
+                    // regular expression parsing. It also concerns '\\' on
+                    // Windows OS types.
+                    if (wc[i] == QLatin1Char('/') || wc[i] == nativePathSeparator)
+                        return rx;
+                    if (wc[i] == QLatin1Char('\\'))
+                        rx += QLatin1Char('\\');
+                    rx += wc[i++];
+                }
+            }
+            break;
+        default:
+            rx += c;
+            break;
+        }
+    }
+
+    return anchoredPattern(rx);
+}
+
+QString Qmmp::anchoredPattern(const QString &expression)
+{
+    return QString()
+            + QLatin1String("\\A(?:")
+            + expression
+            + QLatin1String(")\\z");
+}
+#endif
diff --git a/src/qmmp/qmmp.h b/src/qmmp/qmmp.h
index 5c556c1ad..d6530796d 100644
--- a/src/qmmp/qmmp.h
+++ b/src/qmmp/qmmp.h
@@ -197,6 +197,11 @@ public:
     static bool isPortable();
 #endif
 
+#if QT_VERSION < QT_VERSION_CHECK(5, 12, 0)
+    QString wildcardToRegularExpression(const QString &pattern);
+    QString anchoredPattern(const QString &expression);
+#endif
+
 private:
     static QString m_configDir;
     static QString m_langID;
diff --git a/src/qmmpui/fileloader.cpp b/src/qmmpui/fileloader.cpp
index 594479df9..fc7ca4971 100644
--- a/src/qmmpui/fileloader.cpp
+++ b/src/qmmpui/fileloader.cpp
@@ -127,7 +127,11 @@ void FileLoader::insertPlayList(const QString &path, PlayListItem *before)
         QList<QRegularExpression> regExps =  MetaDataManager::instance()->regExps();
         QList<QRegularExpression> filters;
         for(const QString &pattern : MetaDataManager::instance()->nameFilters())
+#if QT_VERSION >= QT_VERSION_CHECK(5, 12, 0)
             filters << QRegularExpression(QRegularExpression::wildcardToRegularExpression(pattern), QRegularExpression::CaseInsensitiveOption);
+#else
+            filters << QRegularExpression(Qmmp::wildcardToRegularExpression(pattern), QRegularExpression::CaseInsensitiveOption);
+#endif
 
 
         QList<PlayListTrack *>::iterator it = tracks.begin();