LIB: Use QRegularExpression instead of QRegExp as it's the replacement

src/Lib/Ass/Line.cc

 #include "Line.hh"
 #include "AssFactory.hh"
 
+#include <QRegularExpression>
+
 using namespace Vivy::Ass;
 
 Line::Line(AssFactory *const factory, const QString &lineString)
@@ -22,6 +24,8 @@ Line::Line(AssFactory *const factory, const QString &lineString)
         // NOTE: time is of the form: `h:mm:ss.cc`
     };
 
+    qDebug() << "Try to create line for" << lineString;
+
     static const QString lineHeader = "Dialogue: ";
     if (!lineString.startsWith(lineHeader))
         throw std::runtime_error(("invalid event line header: " + lineString).toStdString());
@@ -57,28 +61,38 @@ Line::Line(AssFactory *const factory, const QString &lineString)
     for (int i = 0; i < LineIndex::Text; ++i)
         contentList.removeFirst();
     ___contentAsText = contentList.join("");
+    qDebug() << "The content text is" << ___contentAsText;
+    initSylFromString(___contentAsText);
 }
 
 void
 Line::initSylFromString(const QString &line) noexcept
 {
     // Matches syllabes like: `{\toto}{\alpha&HFF}content`
-    QRegExp re("(?:{[^}]*})+[^{]*", Qt::CaseInsensitive, QRegExp::RegExp);
+    QRegularExpression re("((?:{[^}]*})+[^{]*)");
+    if (!re.isValid())
+        qFatal("The regex '%s' is not valid...", re.pattern().toStdString().c_str());
 
-    int pos = 0;
+    bool once = false;
     try {
-        while ((pos = re.indexIn(line, pos)) != -1) {
-            qDebug() << re.cap(1);
-            content.append(Syl(this, re.cap(1)));
-            pos += re.matchedLength();
+        qDebug() << "Matching...";
+        QRegularExpressionMatchIterator it = re.globalMatch(line);
+        qDebug() << "Matched!";
+
+        while (it.hasNext()) {
+            QRegularExpressionMatch match = it.next();
+            qDebug() << match.captured(1);
+            content.append(Syl(this, match.captured(1)));
+            once |= true;
         }
     } catch (const std::runtime_error &e) {
         qCritical() << "Failed to init syllabes with line:" << line;
         qCritical() << "Fallback to all line is one syllabe";
-        pos = 0;
+        once = false;
     }
 
-    if (pos == 0) {
+    if (!once) {
+        qDebug() << "Use RAW for" << line;
         content.clear();
         content.append(Syl(this, line, Syl::ConstructMode::Raw));
     }