It's still used a lot.

It's used in non-deprecated public API in:

• ktextwidgets: kfind, kreplace
• kcoreaddons: kstringhandler
• ktexteditor: kateregexp, vimode
• kio: kcoredirlister

Frameworks that use QRegExp but are probably going to be deprecated (based on the KF6 workboard):
kemoticons
khtml
kinit
kross
kwallet

Frameworks that still use QRegExp:
kactivities-stats
kdelibs4support - does this one need to be ported or not?
knewstuff - kmoretools
ktexteditor
plasma-framework - pluginloader

And of course apps in various places, extragear, kdeedu, plasma-workspace ... etc. Are apps included in the scope of this task?

You can skip kemoticons, khtml, kinit, kross, and kdelibs4support.
I don't see any work happening on replacing kwallet so honestly at this point I don't see it going away, the board item might be wishful thinking.

The task title is "port *frameworks* away from QRegExp" so the apps are not in scope. But of course that doesn't mean it's not useful to do so :-)

Status report:
It seems that porting plasma-framework is a bit problematic see D28978, it's only one place where QRegExp is used so not a problem.

What remains:
kactivities-stats
ktexteditor

KTextEditor: porting the search interface to QRegularExression:
https://invent.kde.org/frameworks/ktexteditor/-/merge_requests/7

some parts still in ktexteditor still use QRegExp.

In T12279#236496, @ahmadsamir wrote:

KTextEditor: porting the search interface to QRegularExression:
https://invent.kde.org/frameworks/ktexteditor/-/merge_requests/7

some parts still in ktexteditor still use QRegExp.

OK, that's been merged o/. Some parts remain in ktexteditor, I'll hopefully get to them soon.

However, the vimode is a black box for me, I don't use it and it has many quirks; and while it has an extensive collection of unit tests, I don't want to attempt porting it unless someone who actually uses it volunteers to test (I'll make sure all vimode unit tests still pass).

kactivities-stats, is it still used/needed?

KWallet was ported.

kactivities-stats https://invent.kde.org/frameworks/kactivities-stats/-/merge_requests/9

KTextEditor only has the vimode-related code still not ported to QRE.

plasma-framework: src/declarativeimports/core/datamodel , I don't know how to port this one, keep the QRegExp stuff and add new methods for QRE, or replace QRegExp with QRE? and how to handle DataModel::setKeyRoleFilter()?

There is also some usage in KTextWidgets left

In T12279#246204, @nicolasfella wrote:

There is also some usage in KTextWidgets left

I'll look into it (at first glance I forgot to wrap some #include <QRegExp> in deprecation wrappers).

OK, only kreplacedialog.cpp is still using QRegExp in a _k_slotOk(), I must have missed it the first time around; looking at the code now, it doesn't seem to be used by anything, I commented it out completely and it still compiled just fine. I'll create an MR.

https://invent.kde.org/frameworks/ktextwidgets/-/merge_requests/5

KNewStuff is QRegExp free :)

In T12279#247457, @alex wrote:

KNewStuff is QRegExp free :)

That was implied by not being included in my "what remains" posts :)

So, what remains now is the vimode parts in KTextEditors.

KTexEditor vimode was ported by @jbatrina:
https://invent.kde.org/frameworks/ktexteditor/-/merge_requests/62
https://invent.kde.org/frameworks/ktexteditor/-/merge_requests/67

and the remaining usage of QRegExp in KTextEditor has been ported:
https://invent.kde.org/frameworks/ktexteditor/-/merge_requests/85

So KTextEditor is now all ported.

Remains plasma-framework:

plasma-framework: src/declarativeimports/core/datamodel , I don't know how to port this one, keep the QRegExp stuff and add new methods for QRE, or replace QRegExp with QRE? and how to handle DataModel::setKeyRoleFilter()?

I asked on Plasma on IRC (luckily the plasma team were having their weekly meeting, so I got an answer quickly :)). According to @davidedmundson the plasma-framework/src/declarativeimports/core/datamodel* will be dropped in KF6 (along with DataEngines in plasma in general), so no need to port it to QRegularExpression.