QString arg

[PLUS]

I want to use QString to produce something like following:

This is number 99.

I should note that i want to be able to change it to the following if needed:

This_is_number_99.

or this one:

This-is-number-99.

in which spaces are dynamic, so I used this code:

QString test=" ";
QMessageBox::information(this,"Testing...",tr("This%1is%1number%199.").arg(test));

QString test=" ";
QMessageBox::information(this,"Testing...",tr("This%1is%1number%199.").arg(test));

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the problem is that, because %1 is followed by another number, it does not work as expected, please someone shows me a way to solve this,

any help is appreciated.