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# regexpdialog.cpp Example File
tools/regexp/regexpdialog.cpp

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     #include <QtGui>

     #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);

         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(const QString &)),
                 this, SLOT(refresh()));
         connect(textComboBox, SIGNAL(editTextChanged(const 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.numCaptures());
             captureEdits[i]->setEnabled(i <= rx.numCaptures());
             captureEdits[i]->setText(rx.cap(i));
         }

         setUpdatesEnabled(true);
     }