QRegExp : search a pattern that does not contain another pattern

floreal797

Hi,

I am trying to search the following pattern :
".+$"

But this pattern must not contain a "" tag.

Given the following example:
abba acba adba

If I use the previous pattern, the result is :
acba adba

But the good result, which I want is :
adba

Because I want disallow a tag between the two and border tags.

So, how can I do that?

I use QRegExp and I code in c++ language.

Thank you in advance for your help,

Floréal.

Chris Kawa

One way would be to change the pattern to ".+" and setMinimal(true).
This would give you 2 results: "acba" and "adba". You can then just take the last one.

SGaist

Hi,

Using .+ is a bad idea, essentially you are telling that you want a then everything and anything at list once then a at the end of the line. Looks you are rather looking for at least one word character then end of the line so something like

@\w+$@

Beware this is the real regexp not the one escaped for use with QRegExp.

On a side not you should consider using QRegularExpression if you are using Qt 5

floreal797

Thanks for your quick replies. But...

[quote author="Chris Kawa" date="1418216735"]One way would be to change the pattern to ".+" and setMinimal(true).
This would give you 2 results: "acba" and "adba". You can then just take the last one.
[/quote]

I have try it. I use this code:
@QString res = "not found";
QString data = "abba acba adba";
QRegExp exp;
exp.setMinimal(true);
exp.setPattern(".+");
if (data.contains(exp))
{
QStringList list = exp.capturedTexts();
foreach (QString cap, list) {
qDebug() << cap;
}
}@

But it give me only one result, and the first, not the last:
"acba"

May be something is wrong?

[quote author="SGaist" date="1418217112"]Hi,

Using .+ is a bad idea, essentially you are telling that you want a then everything and anything at list once then a at the end of the line. Looks you are rather looking for at least one word character then end of the line so something like

@\w+$@

Beware this is the real regexp not the one escaped for use with QRegExp.

On a side not you should consider using QRegularExpression if you are using Qt 5[/quote]

I have already tested it, and it works very well. But the string I given here is only an example. In reality, the content between and might not be alphanumerical characters. For example, we can have :
abcd acba ad i>2 ba

where we want to find :
ad i>2 ba

And here, the solution you give does not work anymore...

SGaist

Then use a more specific regexp like

@[\w\s>]+$@

Complete it with the special chars you might get

Chris Kawa

bq. But it give me only one result, and the first, not the last

capturedTexts() returns a list strings captured in a capture clause ( and ). You don't have such. The first element in that list is always the entire matched string so its of no use to you. Either surround the part that you want to capture with () or iterate over matches using indexIn().

Or go with the suggestion SGaist gave.