[SOLVED] I could not change in a special part of string by using Qregexp

[kybernetes]

Hello,

i am trying to change a specific part of string. my string like this.
"size 2 - (
48-50 size)"

and i want to change it like
"size 2 - (
48&50 size)"

because im using - char for split size and color in my string list.
i cant use change the last - to & because this is a special condition.

i use that code:
QString fullVariants = "size 2 - (
48-50 size)"
fullVariants.replace(QRegExp("[0-9]{1,2}\-[0-9]{1,2}"), "\1&\2");
qDebug() << fullVariants;

but debug says, "size 2 (
& size)"

can you help me? i didnt undertand why /1 and /2 doesnt work for changing a part of string.
Thanks.

[wlof]

You need to escape the backslashes in the after argument:

fullVariants.replace(QRegExp("[0-9]{1,2}\-[0-9]{1,2}"), "\\1&\\2");

[kybernetes]

@wlof it gives like that 'size 2 (\1&\2 size)' it does not work..

[wlof]

Ah, that's because you're missing the capturing parentheses in the regexp. Try this:

fullVariants.replace(QRegExp("([0-9]{1,2})\-([0-9]{1,2})"), "\\1&\\2");

[mcosta]

Hi and welcome to devnet,

you have also to capture the components

fullVariants.replace(QRegExp("([0-9]{1,2})-([0-9]{1,2})"), "\\1&\\2");

[kybernetes]

@wlof it works, thank you very much.

[wlof]

You're welcome! :)

Remember to mark the topic as solved!

[mcosta]

@kybernetes Keep in mind that \- is not recognized

[SGaist]

Hi and welcome to devnet,

To help you build regular expression with QRegExp there's the RegExp Tool from Qt's example.

If you're using Qt 5 you should also consider using QRegularExpression which is more powerful and should be faster.