- Qt 5.5
- Qt Widgets
- Regular Expressions Example
- regexpdialog.cpp Example File
- Qt 5.5.1 Reference Documentation

# regexpdialog.cpp Example File

tools/regexp/regexpdialog.cpp

    /****************************************************************************
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    ** This file is part of the examples of the Qt Toolkit.
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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);
    }