How many validators can be applied to a single QLineEdit?

[awhite1159]

I have a QLineEdit in a dialog box I am creating that allows entering an IP address. I have used a QRegExp validator to ensure that it takes the form:

"[0-2][0-9][0-9][.][0-2][0-9][0-9][.][0-2][0-9][0-9][.][0-2][0-9][0-9]"

(I know I need some improvement with regular expressions...)

This works ok but I still need to range check so each of the four values are within 0-255.

Can multiple validators be applied to the same widget?

Or, am I going about this all wrong?

I was thinking it might be better to break down the QLineEdit into four separate ones, use the range checking of a QIntValidator and then convert to one single QString after it is valid?

[jacek]

This works ok but I still need to range check so each of the four values are within 0-255.

You can achieve this with a regular expression.

Can multiple validators be applied to the same widget?

No, but you can create a CompositeValidator class that will aggregate several validators.

[awhite1159]

Thanks Jacek.

As I said, I need to improve my regular expressions knowledge. Time to pull out my O'Reilly AWK reference and read up on regular expressions.

[jacek]

Time to pull out my O'Reilly AWK reference and read up on regular expressions.

See this one: http://regex.info/

[awhite1159]

Got it:
QRegExp rx("(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)");

(All on a single line.)