QRegularExpressionMatch
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If they are not nested (i.e. you never have
{Instrument0=82.4,{Instrument11=-900.0, Instrument1=135.33125000000007}, Instrument4=83.91875000000005}) then you can use:const QString input = "2017-10-19 14:08:58,325 TRACE [Publisher] C.DataPublisher [DataPublisher.java:159] Publishing {Instrument12=-900.0, Instrument0=82.4, Instrument11=-900.0, Instrument1=131.16875000000005, Instrument2=1.0, Instrument13=0.0, Instrument3=120.091247064, Instrument6=-0.9, Instrument22, Instrument4=83.91875000000005, Instrument12Status=1.0, Instrument13Status=1.0}" "2017-10-19 14:08:58,825 TRACE [Publisher] C.DataPublisher [DataPublisher.java:159] Publishing {Instrument0=82.4, Instrument11=-900.0, Instrument1=135.33125000000007, Instrument3=120.091247064, Instrument4=83.91875000000005, Instrument22, Instrument23=-900.0, Instrument31=-900.0}"; const QRegularExpression filterJunk(QStringLiteral("{(.+?)}")); const QRegularExpression instrumentRegExp(QStringLiteral(R"**(,?\s*Instrument(\d+)(?:Status)?\s*(?:=\s*([-+]?\d*\.?\d+(?:[eE][-+]?\d+)?))?)**"),QRegularExpression::CaseInsensitiveOption); auto i = filterJunk.globalMatch(input); while (i.hasNext()) { auto j= instrumentRegExp.globalMatch(i.next().capturedRef(1)); while (j.hasNext()) { const auto match = j.next(); QString result = QStringLiteral("Instrument: %1").arg(match.capturedRef(1).toInt()); if(match.lastCapturedIndex()>1) result += QStringLiteral(" Value: %1").arg(match.capturedRef(2).toDouble()); qDebug() << result ; } }VRonin strikes again :D
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For sure! Thanks VRonin.
A couple more questions - is it possible to pass in a variable as part of the regex matching line?
Also I don't seem to have the QRegularExpression Tool example (mentioned above). I'm using: Qt Creator 4.2.1 Based on Qt 5.8.0 (MSVC 2015, 32 bit)
Do I need to update my IDE to get it?
-Scott
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For sure! Thanks VRonin.
A couple more questions - is it possible to pass in a variable as part of the regex matching line?
Also I don't seem to have the QRegularExpression Tool example (mentioned above). I'm using: Qt Creator 4.2.1 Based on Qt 5.8.0 (MSVC 2015, 32 bit)
Do I need to update my IDE to get it?
-Scott
is it possible to pass in a variable as part of the regex matching line?
can you explain better? maybe with an example?
Also I don't seem to have the QRegularExpression Tool example (mentioned above).
I use https://regex101.com/ same principle, better colours and allows you to unit-test too
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Sorry, yes - I mean in the regular expression line:
instrumentRegExp(R"(,?\sInstrument(\d+)(?:Status)?\s(?:=\s*([-+]?\d*.?\d+(?:[eE][-+]?\d+)?))?)"
where its looking for an Instrument, is there a way to do something like this:
instrumentRegExp(R"(,?\sMyStringVariableHere(\d+)(?:Status)?\s(?:=\s*([-+]?\d*.?\d+(?:[eE][-+]?\d+)?))?)"
Regarding regular expression testing, I have realized that my text editor supports regex searching. I think it would be just a few tweaks to move them from there to QT.
Thanks again!
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@MScottM said in QRegularExpressionMatch:
where its looking for an Instrument, is there a way to do something like this:
instrumentRegExp(R"(,?\sMyStringVariableHere(\d+)(?:Status)?\s(?:=\s*([-+]?\d*.?\d+(?:[eE][-+]?\d+)?))?)**"Well, just insert them as a variable to a
QStringbefore you pass the QString toQRegularExpression().QString myString("Static text with %1 some %2 variables").arg("foo").arg("bar");Industrial process automation software: https://simulton.com
Embedded Graphics & GUI library: https://ugfx.io -
@MScottM said in QRegularExpressionMatch:
where its looking for an Instrument, is there a way to do something like this:
instrumentRegExp(R"(,?\sMyStringVariableHere(\d+)(?:Status)?\s(?:=\s*([-+]?\d*.?\d+(?:[eE][-+]?\d+)?))?)**"Well, just insert them as a variable to a
QStringbefore you pass the QString toQRegularExpression().QString myString("Static text with %1 some %2 variables").arg("foo").arg("bar");Side note:
@Joel-Bodenmann Let's stare into the abyss of
arg().arg(): http://doc.qt.io/qt-5/qstring.html#arg-12"La mort n'est rien, mais vivre vaincu et sans gloire, c'est mourir tous les jours"
~Napoleon BonaparteOn a crusade to banish setIndexWidget() from the holy land of Qt
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Side note:
@Joel-Bodenmann Let's stare into the abyss of
arg().arg(): http://doc.qt.io/qt-5/qstring.html#arg-12@VRonin That was interesting - didn't know about that one :p
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Side note:
@Joel-Bodenmann Let's stare into the abyss of
arg().arg(): http://doc.qt.io/qt-5/qstring.html#arg-12You're a overplaying it a bit, aren't you? :)
I mean I knew of that pitfall, but there's nothing wrong in usingarg().arg()as long as you're aware of this peculiarity, right?Read and abide by the Qt Code of Conduct
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You're a overplaying it a bit, aren't you? :)
I mean I knew of that pitfall, but there's nothing wrong in usingarg().arg()as long as you're aware of this peculiarity, right?Warning: philosophical talk below.
I'm actually surprised to hear this from you, @kshegunov. I used
argabove so I'm not 100% dogmatic on it but lets take a good look at it:argis a search and replace so it's slower thanQString::operator+(if you concatenate a lot you can useoperator%(const QString&,const QString&)inQStringBuilder). This should be reason enough not to use it. If you add thearg().arg()pitfall, that applies to any string you don't have complete control over all the aspect of input, it makes it almost evil.The only reason to use
arg()I can see is internationalisation, but, even then, you have to take care of just usingarg(const QString&)as numbers shown to the user should be processed byQLocaleand be mindful that if you callargmore than once on the same string you are opening yourself to a translator possibly introducing what looks like a logic bug in your code -
Success!!
This piece of code is working now! Nearly exactly as VRonin posted...Plus I learned something from the discussion above: I have a lot to learn :)
I wanted to ask about the capitol R that starts off the RegEx string - I figured out that it lets you use the single escape characters, but I couldn't find it documented anywhere...?
Thanks to all and best regards!
Scott
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Success!!
This piece of code is working now! Nearly exactly as VRonin posted...Plus I learned something from the discussion above: I have a lot to learn :)
I wanted to ask about the capitol R that starts off the RegEx string - I figured out that it lets you use the single escape characters, but I couldn't find it documented anywhere...?
Thanks to all and best regards!
Scott
@MScottM said in QRegularExpressionMatch:
I wanted to ask about the capitol R that starts off the RegEx string - I figured out that it lets you use the single escape characters, but I couldn't find it documented anywhere...?
