QRegExp issue

Cobra91151

Hi! I want to remove special characters from QLineEdit text.

Code:
qDebug() << htmlCharsCheck(ui->lineEdit->text());

QString Test::htmlCharsCheck(QString userInput)
{
    QString testStr = userInput;
    testStr.remove(QRegExp(QString::fromUtf8("[-`~!@#$%^&*()_—+=|:;<>«»,.?/{}\'\"\\[\\]\\]")));
    return testStr;
}

The problem is that it doesn't remove those characters from the QString. For example it returns <b>[b][/b].
How to fix it? Thanks.

Paul Colby

Hi @Cobra91151,

Side note: QRegularExpression supersedes QRegExp - see http://doc.qt.io/qt-5/qregularexpression.html#notes-for-qregexp-users for example.

Anyway, there's a few problems with the pattern: the escapes are not right, for example ' doesn't need escaping, nor does the final ], and the second-last \] should be \\]. The pattern should be:

    testStr.remove(QRegExp(QString::fromUtf8("[-`~!@#$%^&*()_—+=|:;<>«»,.?/{}'\"[\\]]")));

Also, depending on your needs, you might be better off with something like this instead:

    testStr.remove(QRegExp(QString::fromUtf8("[^a-zA-Z \\s]")));

Or perhaps even:

    return testStr.toHtmlEscaped();

Which does give quite a different result for your sample input, but might be more in line with what you want to achieve?

Cheers.

Cobra91151

@Paul-Colby

Yes, it's working well. Thank you.