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<title>A Small Application for Testing Regular Expressions</title>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>A Small Application for Testing Regular Expressions</h1>
<p>
<p> Regular expressions can sometimes be tricky to get right,
especially those that use the * quantifier. This application lets
you type in a regexp (without doubling the backslashes) and some
test text, and to execute the regexp and see the results. If you
click the Copy button the regexp will be copied to the clipboard
(with the backslashes doubled, ready for you to paste into your
program). Previous regexps and test texts are remembered
throughout the session and can be accessed by dropping down the
comboboxes.
<p> <hr>
<p> Header file:
<p> <pre>#ifndef REGEXPTESTER_H
#define REGEXPTESTER_H
#include <<a href="qdialog-h.html">qdialog.h</a>>
class QCheckBox;
class QComboBox;
class QLabel;
class QPushButton;
class QStatusBar;
class QTable;
class RegexpTester : public <a href="qdialog.html">QDialog</a>
{
<a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
public:
RegexpTester(QWidget* parent=0, const char* name=0, bool modal=false,
WFlags f=0);
<a href="qlabel.html">QLabel</a> *regexLabel;
<a href="qcombobox.html">QComboBox</a> *regexComboBox;
<a href="qlabel.html">QLabel</a> *textLabel;
<a href="qcombobox.html">QComboBox</a> *textComboBox;
<a href="qcheckbox.html">QCheckBox</a> *caseSensitiveCheckBox;
<a href="qcheckbox.html">QCheckBox</a> *minimalCheckBox;
<a href="qcheckbox.html">QCheckBox</a> *wildcardCheckBox;
<a href="qtable.html">QTable</a> *resultTable;
<a href="qpushbutton.html">QPushButton</a> *executePushButton;
<a href="qpushbutton.html">QPushButton</a> *copyPushButton;
<a href="qpushbutton.html">QPushButton</a> *quitPushButton;
<a href="qstatusbar.html">QStatusBar</a> *statusBar;
public slots:
void copy();
void execute();
private:
void languageChange();
};
#endif // REGEXPTESTER_H
</pre>
<p> <hr>
<p> Implementation:
<p> <pre>#include <<a href="qapplication-h.html">qapplication.h</a>>
#include <<a href="qcheckbox-h.html">qcheckbox.h</a>>
#include <<a href="qclipboard-h.html">qclipboard.h</a>>
#include <<a href="qcombobox-h.html">qcombobox.h</a>>
#include <<a href="qlabel-h.html">qlabel.h</a>>
#include <<a href="qlayout-h.html">qlayout.h</a>>
#include <<a href="qpushbutton-h.html">qpushbutton.h</a>>
#include <<a href="qregexp-h.html">qregexp.h</a>>
#include <<a href="qstatusbar-h.html">qstatusbar.h</a>>
#include <<a href="qtable-h.html">qtable.h</a>>
#include "regexptester.h"
<a name="f556"></a>RegexpTester::RegexpTester(QWidget* parent, const char* name, bool modal,
WFlags f)
: <a href="qdialog.html">QDialog</a>(parent, name, modal, f)
{
regexLabel = new <a href="qlabel.html">QLabel</a>(this);
regexComboBox = new <a href="qcombobox.html">QComboBox</a>(this);
<a name="x2480"></a> regexComboBox-><a href="qcombobox.html#setEditable">setEditable</a>(true);
<a name="x2507"></a> regexComboBox-><a href="qwidget.html#setSizePolicy">setSizePolicy</a>(QSizePolicy::Expanding, QSizePolicy::Preferred);
<a name="x2482"></a> regexLabel-><a href="qlabel.html#setBuddy">setBuddy</a>(regexComboBox);
textLabel = new <a href="qlabel.html">QLabel</a>(this);
textComboBox = new <a href="qcombobox.html">QComboBox</a>(this);
textComboBox-><a href="qcombobox.html#setEditable">setEditable</a>(true);
textComboBox-><a href="qwidget.html#setSizePolicy">setSizePolicy</a>(QSizePolicy::Expanding, QSizePolicy::Preferred);
textLabel-><a href="qlabel.html#setBuddy">setBuddy</a>(textComboBox);
caseSensitiveCheckBox = new <a href="qcheckbox.html">QCheckBox</a>(this);
<a name="x2475"></a> caseSensitiveCheckBox-><a href="qcheckbox.html#setChecked">setChecked</a>(true);
minimalCheckBox = new <a href="qcheckbox.html">QCheckBox</a>(this);
wildcardCheckBox = new <a href="qcheckbox.html">QCheckBox</a>(this);
resultTable = new <a href="qtable.html">QTable</a>(3, 3, this);
<a name="x2506"></a> resultTable-><a href="qtable.html#verticalHeader">verticalHeader</a>()->hide();
<a name="x2501"></a> resultTable-><a href="qtable.html#setLeftMargin">setLeftMargin</a>(0);
<a name="x2499"></a> resultTable-><a href="qtable.html#horizontalHeader">horizontalHeader</a>()->hide();
<a name="x2505"></a> resultTable-><a href="qtable.html#setTopMargin">setTopMargin</a>(0);
<a name="x2503"></a> resultTable-><a href="qtable.html#setReadOnly">setReadOnly</a>(true);
executePushButton = new <a href="qpushbutton.html">QPushButton</a>(this);
<a name="x2484"></a> executePushButton-><a href="qpushbutton.html#setDefault">setDefault</a>(true);
copyPushButton = new <a href="qpushbutton.html">QPushButton</a>(this);
quitPushButton = new <a href="qpushbutton.html">QPushButton</a>(this);
statusBar = new <a href="qstatusbar.html">QStatusBar</a>(this);
<a href="qgridlayout.html">QGridLayout</a> *gridLayout = new <a href="qgridlayout.html">QGridLayout</a>(2, 2, 6);
gridLayout-><a href="qgridlayout.html#addWidget">addWidget</a>(regexLabel, 0, 0);
gridLayout-><a href="qgridlayout.html#addWidget">addWidget</a>(regexComboBox, 0, 1);
gridLayout-><a href="qgridlayout.html#addWidget">addWidget</a>(textLabel, 1, 0);
gridLayout-><a href="qgridlayout.html#addWidget">addWidget</a>(textComboBox, 1, 1);
<a href="qhboxlayout.html">QHBoxLayout</a> *checkboxLayout = new <a href="qhboxlayout.html">QHBoxLayout</a>(0, 6, 6);
checkboxLayout-><a href="qboxlayout.html#addWidget">addWidget</a>(caseSensitiveCheckBox);
checkboxLayout-><a href="qboxlayout.html#addWidget">addWidget</a>(minimalCheckBox);
checkboxLayout-><a href="qboxlayout.html#addWidget">addWidget</a>(wildcardCheckBox);
<a name="x2470"></a> checkboxLayout-><a href="qboxlayout.html#addStretch">addStretch</a>(1);
<a href="qvboxlayout.html">QVBoxLayout</a> *buttonLayout = new <a href="qvboxlayout.html">QVBoxLayout</a>(0, 6, 6);
buttonLayout-><a href="qboxlayout.html#addWidget">addWidget</a>(executePushButton);
buttonLayout-><a href="qboxlayout.html#addWidget">addWidget</a>(copyPushButton);
buttonLayout-><a href="qboxlayout.html#addWidget">addWidget</a>(quitPushButton);
buttonLayout-><a href="qboxlayout.html#addStretch">addStretch</a>(1);
<a href="qhboxlayout.html">QHBoxLayout</a> *middleLayout = new <a href="qhboxlayout.html">QHBoxLayout</a>(0, 6, 6);
middleLayout-><a href="qboxlayout.html#addWidget">addWidget</a>(resultTable);
<a name="x2469"></a> middleLayout-><a href="qboxlayout.html#addLayout">addLayout</a>(buttonLayout);
<a href="qvboxlayout.html">QVBoxLayout</a> *mainLayout = new <a href="qvboxlayout.html">QVBoxLayout</a>(this, 6, 6);
mainLayout-><a href="qboxlayout.html#addLayout">addLayout</a>(gridLayout);
mainLayout-><a href="qboxlayout.html#addLayout">addLayout</a>(checkboxLayout);
mainLayout-><a href="qboxlayout.html#addLayout">addLayout</a>(middleLayout);
mainLayout-><a href="qboxlayout.html#addWidget">addWidget</a>(statusBar);
<a href="qwidget.html#resize">resize</a>(QSize(500, 350).expandedTo(<a href="qwidget.html#minimumSizeHint">minimumSizeHint</a>()));
languageChange();
<a href="qobject.html#connect">connect</a>(copyPushButton, SIGNAL(<a href="qbutton.html#clicked">clicked</a>()), this, SLOT(copy()));
<a href="qobject.html#connect">connect</a>(executePushButton, SIGNAL(<a href="qbutton.html#clicked">clicked</a>()), this, SLOT(execute()));
<a href="qobject.html#connect">connect</a>(quitPushButton, SIGNAL(<a href="qbutton.html#clicked">clicked</a>()), this, SLOT(<a href="qdialog.html#accept">accept</a>()));
execute();
}
void <a name="f557"></a>RegexpTester::execute()
{
<a name="x2478"></a> <a href="qstring.html">QString</a> regex = regexComboBox-><a href="qcombobox.html#currentText">currentText</a>();
<a href="qstring.html">QString</a> text = textComboBox-><a href="qcombobox.html#currentText">currentText</a>();
if (!regex.<a href="qstring.html#isEmpty">isEmpty</a>() && !text.<a href="qstring.html#isEmpty">isEmpty</a>()) {
<a href="qregexp.html">QRegExp</a> re(regex);
<a name="x2491"></a><a name="x2474"></a> re.<a href="qregexp.html#setCaseSensitive">setCaseSensitive</a>(caseSensitiveCheckBox-><a href="qcheckbox.html#isChecked">isChecked</a>());
<a name="x2492"></a> re.<a href="qregexp.html#setMinimal">setMinimal</a>(minimalCheckBox-><a href="qcheckbox.html#isChecked">isChecked</a>());
bool wildcard = wildcardCheckBox-><a href="qcheckbox.html#isChecked">isChecked</a>();
<a name="x2493"></a> re.<a href="qregexp.html#setWildcard">setWildcard</a>(wildcard);
<a name="x2487"></a> if (!re.<a href="qregexp.html#isValid">isValid</a>()) {
<a name="x2494"></a> statusBar-><a href="qstatusbar.html#message">message</a>(<a href="qobject.html#tr">tr</a>("Invalid <a href="qregexp.html#regular-expression">regular expression</a>: %1")
<a name="x2486"></a> .arg(re.<a href="qregexp.html#errorString">errorString</a>()));
return;
}
<a name="x2490"></a> int offset = re.<a href="qregexp.html#search">search</a>(text);
<a name="x2489"></a> int captures = re.<a href="qregexp.html#numCaptures">numCaptures</a>();
int row = 0;
const int OFFSET = 5;
<a name="x2502"></a> resultTable-><a href="qtable.html#setNumRows">setNumRows</a>(0);
resultTable-><a href="qtable.html#setNumRows">setNumRows</a>(captures + OFFSET);
<a name="x2504"></a> resultTable-><a href="qtable.html#setText">setText</a>(row, 0, tr("Regex"));
<a href="qstring.html">QString</a> escaped = regex;
<a name="x2497"></a> escaped = escaped.<a href="qstring.html#replace">replace</a>("\\", "\\\\");
resultTable-><a href="qtable.html#setText">setText</a>(row, 1, escaped);
<a name="x2500"></a> resultTable-><a href="qtable.html#item">item</a>(row, 1)->setSpan(1, 2);
if (offset != -1) {
++row;
resultTable-><a href="qtable.html#setText">setText</a>(row, 0, tr("Offset"));
resultTable-><a href="qtable.html#setText">setText</a>(row, 1, QString::number(offset));
resultTable-><a href="qtable.html#item">item</a>(row, 1)->setSpan(1, 2);
if (!wildcard) {
++row;
resultTable-><a href="qtable.html#setText">setText</a>(row, 0, tr("Captures"));
resultTable-><a href="qtable.html#setText">setText</a>(row, 1, QString::number(captures));
resultTable-><a href="qtable.html#item">item</a>(row, 1)->setSpan(1, 2);
++row;
resultTable-><a href="qtable.html#setText">setText</a>(row, 1, tr("Text"));
resultTable-><a href="qtable.html#setText">setText</a>(row, 2, tr("Characters"));
}
++row;
resultTable-><a href="qtable.html#setText">setText</a>(row, 0, tr("Match"));
<a name="x2485"></a> resultTable-><a href="qtable.html#setText">setText</a>(row, 1, re.<a href="qregexp.html#cap">cap</a>(0));
<a name="x2488"></a> resultTable-><a href="qtable.html#setText">setText</a>(row, 2, QString::number(re.<a href="qregexp.html#matchedLength">matchedLength</a>()));
if (!wildcard) {
for (int i = 1; i <= captures; ++i) {
resultTable-><a href="qtable.html#setText">setText</a>(row + i, 0, tr("Capture #%1").arg(i));
resultTable-><a href="qtable.html#setText">setText</a>(row + i, 1, re.<a href="qregexp.html#cap">cap</a>(i));
resultTable-><a href="qtable.html#setText">setText</a>(row + i, 2,
<a name="x2496"></a> QString::<a href="qstring.html#number">number</a>(re.<a href="qregexp.html#cap">cap</a>(i).length()));
}
}
else
resultTable-><a href="qtable.html#setNumRows">setNumRows</a>(3);
}
else {
resultTable-><a href="qtable.html#setNumRows">setNumRows</a>(2);
++row;
resultTable-><a href="qtable.html#setText">setText</a>(row, 0, tr("No matches"));
resultTable-><a href="qtable.html#item">item</a>(row, 0)->setSpan(1, 3);
}
<a name="x2498"></a> resultTable-><a href="qtable.html#adjustColumn">adjustColumn</a>(0);
resultTable-><a href="qtable.html#adjustColumn">adjustColumn</a>(1);
resultTable-><a href="qtable.html#adjustColumn">adjustColumn</a>(2);
statusBar-><a href="qstatusbar.html#message">message</a>(<a href="qobject.html#tr">tr</a>("Executed \"%1\" on \"%2\"")
.arg(escaped).arg(text));
}
else
statusBar-><a href="qstatusbar.html#message">message</a>(<a href="qobject.html#tr">tr</a>("A regular expression and a text must be given"));
}
void <a name="f558"></a>RegexpTester::copy()
{
<a href="qstring.html">QString</a> escaped = regexComboBox-><a href="qcombobox.html#currentText">currentText</a>();
if (!escaped.<a href="qstring.html#isEmpty">isEmpty</a>()) {
escaped = escaped.<a href="qstring.html#replace">replace</a>("\\", "\\\\");
<a name="x2468"></a> <a href="qclipboard.html">QClipboard</a> *cb = QApplication::<a href="qapplication.html#clipboard">clipboard</a>();
<a name="x2476"></a> cb-><a href="qclipboard.html#setText">setText</a>(escaped, QClipboard::Clipboard);
<a name="x2477"></a> if (cb-><a href="qclipboard.html#supportsSelection">supportsSelection</a>())
cb-><a href="qclipboard.html#setText">setText</a>(escaped, QClipboard::Selection);
statusBar-><a href="qstatusbar.html#message">message</a>(<a href="qobject.html#tr">tr</a>("Copied \"%1\" to the clipboard")
.arg(escaped));
}
}
void <a name="f559"></a>RegexpTester::languageChange()
{
<a href="qwidget.html#setCaption">setCaption</a>(<a href="qobject.html#tr">tr</a>("Regex Tester"));
regexLabel-><a href="qlabel.html#setText">setText</a>(<a href="qobject.html#tr">tr</a>("&Regex:"));
<a name="x2479"></a> regexComboBox-><a href="qcombobox.html#insertItem">insertItem</a>(<a href="qobject.html#tr">tr</a>("[A-Z]+=(\\d+):(\\d*)"));
textLabel-><a href="qlabel.html#setText">setText</a>(<a href="qobject.html#tr">tr</a>("&Text:"));
textComboBox-><a href="qcombobox.html#insertItem">insertItem</a>(<a href="qobject.html#tr">tr</a>("ABC=12:3456"));
<a name="x2473"></a> caseSensitiveCheckBox-><a href="qbutton.html#setText">setText</a>(<a href="qobject.html#tr">tr</a>("Case &Sensitive"));
minimalCheckBox-><a href="qbutton.html#setText">setText</a>(<a href="qobject.html#tr">tr</a>("&Minimal"));
wildcardCheckBox-><a href="qbutton.html#setText">setText</a>(<a href="qobject.html#tr">tr</a>("&Wildcard"));
copyPushButton-><a href="qbutton.html#setText">setText</a>(<a href="qobject.html#tr">tr</a>("&Copy"));
executePushButton-><a href="qbutton.html#setText">setText</a>(<a href="qobject.html#tr">tr</a>("&Execute"));
quitPushButton-><a href="qbutton.html#setText">setText</a>(<a href="qobject.html#tr">tr</a>("&Quit"));
}
</pre>
<p> <hr>
<p> Main:
<p> <pre>#include <<a href="qapplication-h.html">qapplication.h</a>>
#include "regexptester.h"
int main(int argc, char **argv)
{
<a href="qapplication.html">QApplication</a> app(argc, argv);
RegexpTester form;
<a name="x2511"></a> form.<a href="qdialog.html#show">show</a>();
<a name="x2512"></a><a name="x2510"></a><a name="x2509"></a> app.<a href="qobject.html#connect">connect</a>(&app, SIGNAL(<a href="qapplication.html#lastWindowClosed">lastWindowClosed</a>()), &app, SLOT(<a href="qapplication.html#quit">quit</a>()));
return app.<a href="qapplication.html#exec">exec</a>();
}
</pre>
<p>See also <a href="examples.html">Examples</a>.
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