Implement QRegularExpression overload for QTextEdit::find

This patch adds the missing overload for QRegularExpression to match the
QRegExp one for QTextEdit.

[ChangeLog][QtWidgets][QTextEdit] Added QRegularExpression find() method
overload.

Change-Id: Ic7be224dcc59fc8d832daddd1999a713b7f04253
Reviewed-by: Luca Beldi <v.ronin@yahoo.it>
Reviewed-by: David Faure <david.faure@kdab.com>

src/widgets/widgets/qtextedit.cpp

@@ -2533,6 +2533,27 @@ bool QTextEdit::find(const QRegExp &exp, QTextDocument::FindFlags options)
 }
 #endif
 
+/*!
+    \fn bool QTextEdit::find(const QRegularExpression &exp, QTextDocument::FindFlags options)
+
+    \since 5.13
+    \overload
+
+    Finds the next occurrence, matching the regular expression, \a exp, using the given
+    \a options. The QTextDocument::FindCaseSensitively option is ignored for this overload,
+    use QRegularExpression::CaseInsensitiveOption instead.
+
+    Returns \c true if a match was found and changes the cursor to select the match;
+    otherwise returns \c false.
+*/
+#if QT_CONFIG(regularexpression)
+bool QTextEdit::find(const QRegularExpression &exp, QTextDocument::FindFlags options)
+{
+    Q_D(QTextEdit);
+    return d->control->find(exp, options);
+}
+#endif
+
 /*!
     \fn void QTextEdit::copyAvailable(bool yes)
 

src/widgets/widgets/qtextedit.h

@@ -57,6 +57,7 @@ class QMenu;
 class QTextEditPrivate;
 class QMimeData;
 class QPagedPaintDevice;
+class QRegularExpression;
 
 class Q_WIDGETS_EXPORT QTextEdit : public QAbstractScrollArea
 {
@@ -165,6 +166,9 @@ public:
 #ifndef QT_NO_REGEXP
     bool find(const QRegExp &exp, QTextDocument::FindFlags options = QTextDocument::FindFlags());
 #endif
+#if QT_CONFIG(regularexpression)
+    bool find(const QRegularExpression &exp, QTextDocument::FindFlags options = QTextDocument::FindFlags());
+#endif
 
     QString toPlainText() const;
 #ifndef QT_NO_TEXTHTMLPARSER

src/widgets/widgets/qwidgettextcontrol.cpp

@@ -3094,6 +3094,19 @@ bool QWidgetTextControl::find(const QRegExp &exp, QTextDocument::FindFlags optio
 }
 #endif
 
+#if QT_CONFIG(regularexpression)
+bool QWidgetTextControl::find(const QRegularExpression &exp, QTextDocument::FindFlags options)
+{
+    Q_D(QWidgetTextControl);
+    QTextCursor search = d->doc->find(exp, d->cursor, options);
+    if (search.isNull())
+        return false;
+
+    setTextCursor(search);
+    return true;
+}
+#endif
+
 QString QWidgetTextControl::toPlainText() const
 {
     return document()->toPlainText();

src/widgets/widgets/qwidgettextcontrol_p.h

@@ -80,6 +80,7 @@ class QMenu;
 class QWidgetTextControlPrivate;
 class QAbstractScrollArea;
 class QEvent;
+class QRegularExpression;
 class QTimerEvent;
 
 class Q_WIDGETS_EXPORT QWidgetTextControl : public QInputControl
@@ -119,6 +120,9 @@ public:
 #ifndef QT_NO_REGEXP
     bool find(const QRegExp &exp, QTextDocument::FindFlags options = 0);
 #endif
+#if QT_CONFIG(regularexpression)
+    bool find(const QRegularExpression &exp, QTextDocument::FindFlags options = 0);
+#endif
 
     QString toPlainText() const;
 #ifndef QT_NO_TEXTHTMLPARSER

tests/auto/widgets/widgets/qtextedit/tst_qtextedit.cpp

@@ -199,6 +199,12 @@ private slots:
     void findWithRegExpReturnsFalseIfNoMoreResults();
 #endif
 
+#if QT_CONFIG(regularexpression)
+    void findWithRegularExpression();
+    void findBackwardWithRegularExpression();
+    void findWithRegularExpressionReturnsFalseIfNoMoreResults();
+#endif
+
 #if QT_CONFIG(wheelevent)
     void wheelEvent();
 #endif
@@ -2572,6 +2578,45 @@ void tst_QTextEdit::findWithRegExpReturnsFalseIfNoMoreResults()
 }
 #endif
 
+#if QT_CONFIG(regularexpression)
+void tst_QTextEdit::findWithRegularExpression()
+{
+    ed->setHtml(QStringLiteral("arbitrary te<span style=\"color:#ff0000\">xt</span>"));
+    QRegularExpression rx("\\w{2}xt");
+
+    bool found = ed->find(rx);
+
+    QVERIFY(found);
+    QCOMPARE(ed->textCursor().selectedText(), QStringLiteral("text"));
+}
+
+void tst_QTextEdit::findBackwardWithRegularExpression()
+{
+    ed->setPlainText(QStringLiteral("arbitrary text"));
+    QTextCursor cursor = ed->textCursor();
+    cursor.movePosition(QTextCursor::End);
+    ed->setTextCursor(cursor);
+    QRegularExpression rx("a\\w*t");
+
+    bool found = ed->find(rx, QTextDocument::FindBackward);
+
+    QVERIFY(found);
+    QCOMPARE(ed->textCursor().selectedText(), QStringLiteral("arbit"));
+}
+
+void tst_QTextEdit::findWithRegularExpressionReturnsFalseIfNoMoreResults()
+{
+    ed->setPlainText(QStringLiteral("arbitrary text"));
+    QRegularExpression rx("t.xt");
+    ed->find(rx);
+
+    bool found = ed->find(rx);
+
+    QVERIFY(!found);
+    QCOMPARE(ed->textCursor().selectedText(), QStringLiteral("text"));
+}
+#endif
+
 #if QT_CONFIG(wheelevent)
 
 class TextEdit : public QTextEdit