Qt-interest Archive, July 2006
QRegExp
Message 1 in thread
question:
why QRegExp("/\\*.*\\*/") has no effects ?
Message 2 in thread
On Friday 28 July 2006 10:33 am, Carabut Nicolae wrote:
> question:
>
> why QRegExp("/\\*.*\\*/") has no effects ?
How do you mean no effect?
I can tell you it almost certainly doesn't do what you think it should do.
What you have is equivalent to QRegExp("/.*/")
What were you trying to match?
Julian.
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[ signature omitted ]
Message 3 in thread
yes, sorry.
I'm trying to match this:
/*************************
some remarks
*************************/
this:
/*
*
* Some other remarks
*
*/
and everyhting else that is inside "/*" and "*/"
as I understand:
QRegExp("/\\*") gives me first match "/*"
QRegExp("\\*/") gives me the second match "*/"
and the QRegExp(".*") - matches everything including the new lines symbols.
----- Original Message ----
From: Julian Peterson <weaver@xxxxxxxxxx>
To: qt-interest@xxxxxxxxxxxxx
Sent: Friday, July 28, 2006 8:23:12 AM
Subject: Re: QRegExp
On Friday 28 July 2006 10:33 am, Carabut Nicolae wrote:
> question:
>
> why QRegExp("/\\*.*\\*/") has no effects ?
How do you mean no effect?
I can tell you it almost certainly doesn't do what you think it should do.
What you have is equivalent to QRegExp("/.*/")
What were you trying to match?
Julian.
--
[ signature omitted ]
Message 4 in thread
Von: Carabut Nicolae <carabutnicolae@xxxxxxxxx>
> yes, sorry.
>
> I'm trying to match this:
> /*************************
> some remarks
> *************************/
>
> this:
> /*
> *
> * Some other remarks
> *
> */
>
> and everyhting else that is inside "/*" and "*/"
>
> as I understand:
> QRegExp("/\\*") gives me first match "/*"
> QRegExp("\\*/") gives me the second match "*/"
>
> and the QRegExp(".*") - matches everything including the new lines
> symbols.
>
>
Your RegExp is wrong --> at least "\\" needs to be "\\\\"
See bottom of this chapter:
http://doc.trolltech.com/4.1/qregexp#characters-and-abbreviations-for-sets-of-characters
Christian
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Message 5 in thread
On Friday 28 July 2006 7:43 pm, Christian Ehrlicher wrote:
> Von: Carabut Nicolae <carabutnicolae@xxxxxxxxx>
>
> > yes, sorry.
> >
> > I'm trying to match this:
> > /*************************
> > some remarks
> > *************************/
> >
> > this:
> > /*
> > *
> > * Some other remarks
> > *
> > */
> >
> > and everyhting else that is inside "/*" and "*/"
> >
> > as I understand:
> > QRegExp("/\\*") gives me first match "/*"
> > QRegExp("\\*/") gives me the second match "*/"
> >
> > and the QRegExp(".*") - matches everything including the new lines
> > symbols.
>
> Your RegExp is wrong --> at least "\\" needs to be "\\\\"
No, he's right.
I made the same assumption the first time too. He wants to match a
literal * once rather than a \ zero or more times
Julian.
--
[ signature omitted ]
Message 6 in thread
> Von: Carabut Nicolae <carabutnicolae@xxxxxxxxx>
> > yes, sorry.
> >
> > I'm trying to match this:
> > /*************************
> > some remarks
> > *************************/
> >
> > this:
> > /*
> > *
> > * Some other remarks
> > *
> > */
> >
> > and everyhting else that is inside "/*" and "*/"
> >
> > as I understand:
> > QRegExp("/\\*") gives me first match "/*"
> > QRegExp("\\*/") gives me the second match "*/"
> >
> > and the QRegExp(".*") - matches everything including the new lines
> > symbols.
> >
> >
> Your RegExp is wrong --> at least "\\" needs to be "\\\\"
> See bottom of this chapter:
> http://doc.trolltech.com/4.1/qregexp#characters-and-abbreviations-for-sets-of-characters
>
Ignore my post - it's friday and I really need the weekend ;)
Christian
--
[ signature omitted ]
Message 7 in thread
On Friday 28 July 2006 7:18 pm, Carabut Nicolae wrote:
> yes, sorry.
>
> I'm trying to match this:
> /*************************
> some remarks
> *************************/
>
> this:
> /*
> *
> * Some other remarks
> *
> */
>
> and everyhting else that is inside "/*" and "*/"
>
> as I understand:
> QRegExp("/\\*") gives me first match "/*"
> QRegExp("\\*/") gives me the second match "*/"
>
> and the QRegExp(".*") - matches everything including the new lines
> symbols.
>
Whoops, you are indeed correct. Sorry, confused myself.
How are you using it?
The following gives me a correct answer:
QRegExp r("/\\*.*\\*/");
QString s(" one sdfhsdkjf /* ra blah\n */ dhfggsdhf\n");
int pos = r.search( s, 0 );
cout << "found at " << pos << " length " << r.matchedLength() << endl;
found at 15 length 14
Julian.
--
[ signature omitted ]
Message 8 in thread
thanks, for help.
I will recheck my tests.
----- Original Message ----
From: Julian Peterson <weaver@xxxxxxxxxx>
To: qt-interest@xxxxxxxxxxxxx
Sent: Friday, July 28, 2006 10:52:45 AM
Subject: Re: QRegExp
On Friday 28 July 2006 7:18 pm, Carabut Nicolae wrote:
> yes, sorry.
>
> I'm trying to match this:
> /*************************
> some remarks
> *************************/
>
> this:
> /*
> *
> * Some other remarks
> *
> */
>
> and everyhting else that is inside "/*" and "*/"
>
> as I understand:
> QRegExp("/\\*") gives me first match "/*"
> QRegExp("\\*/") gives me the second match "*/"
>
> and the QRegExp(".*") - matches everything including the new lines
> symbols.
>
Whoops, you are indeed correct. Sorry, confused myself.
How are you using it?
The following gives me a correct answer:
QRegExp r("/\\*.*\\*/");
QString s(" one sdfhsdkjf /* ra blah\n */ dhfggsdhf\n");
int pos = r.search( s, 0 );
cout << "found at " << pos << " length " << r.matchedLength() << endl;
found at 15 length 14
Julian.
--
[ signature omitted ]
Message 9 in thread
What is the frequency of white light?
Please give an example of what you mean... Code usually helps....
Also, I usually will do the following, since QRegExp is very picky WRT
escape characters...
QRegExp regEx( "......" );
Q_ASSERT( regEx.isValid() );
Just to make sure I didn't have a typo...
Scott
________________________________
From: Carabut Nicolae [mailto:carabutnicolae@xxxxxxxxx]
Sent: Thursday, July 27, 2006 3:33 PM
To: qt-interest@xxxxxxxxxxxxx
Subject: QRegExp
question:
why QRegExp("/\\*.*\\*/") has no effects ?
Message 10 in thread
Hi all,
I am fairly new to QRegExp. I have the following:
QRegExp rx ("\\d{1,6}\\.?}\\d{1,6}");
This matches 1-6 digits, followed by a optional decimal point, followed
by 1 to 6 decimals.
What i *actually* want to achieve is this:
If there are 6 or more digits *before* the decimal point, then only 3
digits *after* the decimal point are allowed. If there are less than 6
digits
before the decimal point, then 6 digits after the decimal point are allowed.
Is this possible with regular expressions? Maybe with back references?
Best regards,
Andre
--
[ signature omitted ]
Message 11 in thread
Andre Haupt wrote:
>
> Hi all,
>
> I am fairly new to QRegExp. I have the following:
>
> QRegExp rx ("\\d{1,6}\\.?}\\d{1,6}");
>
> This matches 1-6 digits, followed by a optional decimal point, followed
> by 1 to 6 decimals.
>
>
> What i *actually* want to achieve is this:
>
> If there are 6 or more digits *before* the decimal point, then only 3
> digits *after* the decimal point are allowed. If there are less than 6
> digits
> before the decimal point, then 6 digits after the decimal point are
> allowed.
>
> Is this possible with regular expressions? Maybe with back references?
>
Nevermind, I was trapped in this backreference thing that i didnt see
the obvious.
I solved this by.
QRegExp rx("(\\d{1,3}\\.}\\d{1,6})|(\\d{1,6}\\.}\\d{1,3})|(\\d{1,10})");
Best,
Andre
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