QT Error message

Prathamesh

exactMatch(self, str): first argument of unbound method must have type 'QRegExp'

I am getting this error after writing following line in my code : -

regexp = QRegExp.exactMatch(self, tag).

What is wrong with this?

jsulm

@Prathamesh said in QT Error message:

What is wrong with this?

exactMatch is NOT a static method...

Prathamesh

@jsulm What should I use for exact string matching?

KroMignon

@Prathamesh said in QT Error message:

What should I use for exact string matching?

You have to create a QRegExp() instance, then you can use exactMatch().

According to documentation https://doc.qt.io/qtforpython-5/PySide2/QtCore/QRegExp.html (I think you are using python):

rx = QRegExp("*.txt")
rx.setPatternSyntax(QRegExp.Wildcard)
rx.exactMatch("README.txt")        # returns True
rx.exactMatch("welcome.txt.bak")   # returns False

jsulm

@Prathamesh These are actually Python basics (has nothing to do with Qt):

regexp = QRegExp("YOUR_REGULAR_EXPRESSION_HERE")
result = regexp.exactMatch(tag)

You should also use https://doc.qt.io/qt-5/qregularexpression.html instead of QRegExp.

Prathamesh

@jsulm ok, i am new to both python and Qt as well.

artwaw

@Prathamesh I believe I cautioned you three or four times (in the thread you titled "Problem with/in QTreeview" or similar) that QRegExp is obsolete and much better effects you can have with QRegularExpression which you should use anyway...

Prathamesh

@artwaw Yeah ,but my problem is how to set regexp? If I use QRegExp, I can do it by using self.filter_proxy_model.setFilterRegExp(regexp) <-- this way.

If I use QRegularExpression ,then I have to go for setRegularExpression() method if I understood it correctly. But this method is not available with our qt version. That is why I am looking for an alternatives.

SGaist

Hi,

This means that you are using Qt 4. Be aware that this version has reached end of life a long time ago so you should be careful what you implement with that.