Details
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Bug
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Resolution: Invalid
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Not Evaluated
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None
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5.15
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None
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All
Description
Not sure if this is actually a bug. If not, the documentation could be clearer.
When migrating some old code from QRegExp to QRegularExpression, I noticed that capturedTexts returns a differently sized list for the same use case. The attached code example shows this behavior. For the first text input, the last two capture groups are empty. QRegExp includes them as empty strings in the returned list. QRegularExpressionMatch however, simply returns a list with fewer elements.
The expectation would be that each capture group is included, even if empty.
#include <QDebug> #include <QRegExp> #include <QRegularExpression> #include <QString> static void testQRegExp(const QString ®ex, const QString &text) { QRegExp regExp{regex}; auto index = regExp.indexIn(text); Q_ASSERT(index == 0); qDebug() << regExp.capturedTexts(); } static void testQRegularExpression(const QString ®ex, const QString &text) { auto match = QRegularExpression{regex}.match(text); Q_ASSERT(match.hasMatch()); qDebug() << match.capturedTexts(); } int main(int argc, char *argv[]) { auto regex = QStringLiteral(R"(([a-z]*)=([a-z]+)(\|(.*)){0,1})"); auto text1 = QStringLiteral("test=abc"); auto text2 = QStringLiteral("test=abc|def"); qDebug() << "### QRegExp:"; testQRegExp(regex, text1); testQRegExp(regex, text2); qDebug() << "### QRegularExpression:"; testQRegularExpression(regex, text1); testQRegularExpression(regex, text2); }
The output of that program is this:
### QRegExp: ("test=abc", "test", "abc", "", "") ("test=abc|def", "test", "abc", "|def", "def") ### QRegularExpression: ("test=abc", "test", "abc") ("test=abc|def", "test", "abc", "|def", "def")