Qt regex modifier

[yodusow bardon]

I'm trying to use a regex that uses \u modifier:

(?:\\.(?:[a-z\\u00a1-\\uffff]{2,}))

It would match strings like .com, the tld of an url, but when I call isValid() it returns false and when running I got this warning:

QRegularExpressionPrivate::doMatch(): called on an invalid QRegularExpression object

Is there a solution? What can I be doing in order to solve this?

[mrjj]

@yodusow-bardon said:

Hi
I wonder if
QRegularExpression::UseUnicodePropertiesOption 0x0040
http://doc.qt.io/qt-5/qregularexpression.html
is what you are after?

[A Former User]

@mrjj I tried it too and it doesn't work. I my case I tried - it would match anything, including unicode characters:

[a-z\u00a1-\uffff0-9]*

And when calling isValid it returns false along with the same warning, even using UseUnicodePropertiesOption.

[mrjj]

@Minupi said:
hmm looking in
qregularexpression.cpp
I only see
QT_TRANSLATE_NOOP("QRegularExpression", "PCRE does not support \L, \l, \N{name}, \U, or \u"),

but at same time docs says "It fully supports Unicode"

Does it work if u put the unicode directly in the string ?

[A Former User]

@mrjj I might, but the thing is that I need to use \u as it has a range: \uffff0-9.

I think that I'm going to drop the QRegularExpression and use QRegExp instead.

[mrjj]

@Minupi said:
Well if it just accepts a \u I agree it seems more sensible than to figure out how to do \u like with QRegularExpression.

[A Former User]

@mrjj It's kinda nonsense as QRegularExpresion came to be better than QRegExp, but anyway, let's stick with it as it's the only option left here.

Thank you.

[mrjj]

@yodusow-bardon said:
btw
did u try
\x{FFFF}

[A Former User]

@mrjj Yes, I did and I got an error saying:

hex constants must have at least one hex digit

[A Former User]

@mrjj I fixed it, and it's working now... You just have to escape the \x, like \\x, for instance: [a-z\\x{00a1}-\\x{ffff}0-9]*.

[mrjj]

@Minupi
Oh yes always escape "\"
Super- :)

[A Former User]

@mrjj Thank you, helped a lot. I realised that QRegularExpression is using the same syntax as PHP.

[mrjj]

@Minupi
Good to hear. :)
It says its perl syntax but maybe PHP uses perl style or reverse?

[A Former User]

@mrjj Yes, it resembles perl style, it's called PCRE.

[SGaist]

Hi,

To help you with your regular expression development, you can use the regular expression tool. It's available starting with Qt 5.6