regexpdialog.cpp Example File

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 #include <QtWidgets>

 #include "regexpdialog.h"

 RegExpDialog::RegExpDialog(QWidget *parent)
     : QDialog(parent)
 {
     patternComboBox = new QComboBox;
     patternComboBox->setEditable(true);
     patternComboBox->setSizePolicy(QSizePolicy::Expanding,
                                    QSizePolicy::Preferred);

     patternLabel = new QLabel(tr("&Pattern:"));
     patternLabel->setBuddy(patternComboBox);

     escapedPatternLineEdit = new QLineEdit;
     escapedPatternLineEdit->setReadOnly(true);
     QPalette palette = escapedPatternLineEdit->palette();
     palette.setBrush(QPalette::Base,
                      palette.brush(QPalette::Disabled, QPalette::Base));
     escapedPatternLineEdit->setPalette(palette);

     escapedPatternLabel = new QLabel(tr("&Escaped Pattern:"));
     escapedPatternLabel->setBuddy(escapedPatternLineEdit);

     syntaxComboBox = new QComboBox;
     syntaxComboBox->addItem(tr("Regular expression v1"), QRegExp::RegExp);
     syntaxComboBox->addItem(tr("Regular expression v2"), QRegExp::RegExp2);
     syntaxComboBox->addItem(tr("Wildcard"), QRegExp::Wildcard);
     syntaxComboBox->addItem(tr("Fixed string"), QRegExp::FixedString);
     syntaxComboBox->addItem(tr("W3C Xml Schema 1.1"), QRegExp::W3CXmlSchema11);

     syntaxLabel = new QLabel(tr("&Pattern Syntax:"));
     syntaxLabel->setBuddy(syntaxComboBox);

     textComboBox = new QComboBox;
     textComboBox->setEditable(true);
     textComboBox->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Preferred);

     textLabel = new QLabel(tr("&Text:"));
     textLabel->setBuddy(textComboBox);

     caseSensitiveCheckBox = new QCheckBox(tr("Case &Sensitive"));
     caseSensitiveCheckBox->setChecked(true);
     minimalCheckBox = new QCheckBox(tr("&Minimal"));

     indexLabel = new QLabel(tr("Index of Match:"));
     indexEdit = new QLineEdit;
     indexEdit->setReadOnly(true);

     matchedLengthLabel = new QLabel(tr("Matched Length:"));
     matchedLengthEdit = new QLineEdit;
     matchedLengthEdit->setReadOnly(true);

     for (int i = 0; i < MaxCaptures; ++i) {
         captureLabels[i] = new QLabel(tr("Capture %1:").arg(i));
         captureEdits[i] = new QLineEdit;
         captureEdits[i]->setReadOnly(true);
     }
     captureLabels[0]->setText(tr("Match:"));

     QHBoxLayout *checkBoxLayout = new QHBoxLayout;
     checkBoxLayout->addWidget(caseSensitiveCheckBox);
     checkBoxLayout->addWidget(minimalCheckBox);
     checkBoxLayout->addStretch(1);

     QGridLayout *mainLayout = new QGridLayout;
     mainLayout->addWidget(patternLabel, 0, 0);
     mainLayout->addWidget(patternComboBox, 0, 1);
     mainLayout->addWidget(escapedPatternLabel, 1, 0);
     mainLayout->addWidget(escapedPatternLineEdit, 1, 1);
     mainLayout->addWidget(syntaxLabel, 2, 0);
     mainLayout->addWidget(syntaxComboBox, 2, 1);
     mainLayout->addLayout(checkBoxLayout, 3, 0, 1, 2);
     mainLayout->addWidget(textLabel, 4, 0);
     mainLayout->addWidget(textComboBox, 4, 1);
     mainLayout->addWidget(indexLabel, 5, 0);
     mainLayout->addWidget(indexEdit, 5, 1);
     mainLayout->addWidget(matchedLengthLabel, 6, 0);
     mainLayout->addWidget(matchedLengthEdit, 6, 1);

     for (int j = 0; j < MaxCaptures; ++j) {
         mainLayout->addWidget(captureLabels[j], 7 + j, 0);
         mainLayout->addWidget(captureEdits[j], 7 + j, 1);
     }
     setLayout(mainLayout);

     connect(patternComboBox, SIGNAL(editTextChanged(QString)),
             this, SLOT(refresh()));
     connect(textComboBox, SIGNAL(editTextChanged(QString)),
             this, SLOT(refresh()));
     connect(caseSensitiveCheckBox, SIGNAL(toggled(bool)),
             this, SLOT(refresh()));
     connect(minimalCheckBox, SIGNAL(toggled(bool)), this, SLOT(refresh()));
     connect(syntaxComboBox, SIGNAL(currentIndexChanged(int)),
             this, SLOT(refresh()));

     patternComboBox->addItem(tr("[A-Za-z_]+([A-Za-z_0-9]*)"));
     textComboBox->addItem(tr("(10 + delta4) * 32"));

     setWindowTitle(tr("RegExp"));
     setFixedHeight(sizeHint().height());
     refresh();
 }

 void RegExpDialog::refresh()
 {
     setUpdatesEnabled(false);

     QString pattern = patternComboBox->currentText();
     QString text = textComboBox->currentText();

     QString escaped = pattern;
     escaped.replace("\\", "\\\\");
     escaped.replace("\"", "\\\"");
     escaped.prepend("\"");
     escaped.append("\"");
     escapedPatternLineEdit->setText(escaped);

     QRegExp rx(pattern);
     Qt::CaseSensitivity cs = Qt::CaseInsensitive;
     if (caseSensitiveCheckBox->isChecked())
         cs = Qt::CaseSensitive;
     rx.setCaseSensitivity(cs);
     rx.setMinimal(minimalCheckBox->isChecked());
     QRegExp::PatternSyntax syntax = QRegExp::PatternSyntax(
             syntaxComboBox->itemData(syntaxComboBox->currentIndex()).toInt());
     rx.setPatternSyntax(syntax);

     QPalette palette = patternComboBox->palette();
     if (rx.isValid()) {
         palette.setColor(QPalette::Text,
                          textComboBox->palette().color(QPalette::Text));
     } else {
         palette.setColor(QPalette::Text, Qt::red);
     }
     patternComboBox->setPalette(palette);

     indexEdit->setText(QString::number(rx.indexIn(text)));
     matchedLengthEdit->setText(QString::number(rx.matchedLength()));
     for (int i = 0; i < MaxCaptures; ++i) {
         captureLabels[i]->setEnabled(i <= rx.captureCount());
         captureEdits[i]->setEnabled(i <= rx.captureCount());
         captureEdits[i]->setText(rx.cap(i));
     }

     setUpdatesEnabled(true);
 }