RegExp is deprecated in dart

[bambinoua]

I've upgraded flutter to 3.38.1 and now I have a many deprecation warnings for RegExp.

RegExp is deprecated and shouldn't be used. This class will become 'final' in a future release. 'Pattern' may be a more appropriate interface to implement

So how do I need to migrate from RegExp if Pattern is just interface?

It loos like a lint rule allows me to see such kind of deprecations and I would not like to disable it because I believe it disables all deprecation warnings.

[mraleph]

These deprecation warnings should only be showed when you extend or implement RegExp. Do you see these when you just use RegExp?

[bambinoua]

Unfrotunately I see them on every RegExp I used, i.e.

static const _someRegExp = RegExp(r'...');

[FMorschel]

@mraleph, I've commented at #61214 (comment) (and #55608 (comment) and #60504 (comment)), this happens on completion.

Even RegExp specific members show as deprecated.

[mraleph]

@bambinoua can you post the full error/warning/lint you are getting? I can't repro this with simple usage.

@FMorschel

Even RegExp specific members show as deprecated.

Can you file separate issue for that? Sounds like a bad bug which should be at the very least P1 if not P0 given how core RegExp is.

[FMorschel]

Can you file separate issue for that?

I've opened #62013 and pinged you.

[bambinoua]

@mraleph

can you post the full error/warning/lint you are getting? I can't repro this with simple usage.

I've posted the full message in a first topic. I.e. I saw the exact text which is provided by Deprecate.implementation annotation which is added to RegExp class in all places where the RegExp constructor is used.

[mraleph]

I've posted the full message in a first topic.

I am interested in the message code (e.g. deprecated_member_use) which is part of the whole warning printed by the analyzer (or displayed in the IDE).

[FMorschel]

@bambinoua could you add a screenshot or something for what you mean? I've tested with Flutter 3.38.1 with VS Code, IntelliJ and running dart analyze, and I could not reproduce this.

[mraleph]

I am wondering if it is some other tool (e.g. custom_lint?) or something else (e.g. using outdated analyzer with newer core libs?) which displays these.

[bambinoua]

@bambinoua could you add a screenshot or something for what you mean?

I will do that tomorrow.

[bambinoua]

deprecated_member_use

As I remember I saw this code.

[FMorschel]

I am wondering if it is some other tool (e.g. custom_lint?) or something else (e.g. using outdated analyzer with newer core libs?) which displays these.

I'm not sure how you imagined this, but I did a simple empty project with the old dart_code_metrics, and I got no errors even though it uses the old plugin system, and it solved for analyzer v5.

Repro:

void f() {
  RegExp r;
}

[bambinoua]

Today I've upgraded flutter again and it looks like the issue gone. 🤷‍♂️
So I am closing this issue at the moment.

I'm not sure how you imagined this,

@FMorschel You understand that I didn't come up with this specially. ;)

I am wondering if it is some other tool (e.g. custom_lint?) or something else (e.g. using outdated analyzer with newer core libs?)

@mraleph Maybe. I use only flutter_lints.