fix(parser): fixed dynamicArgAttribute RegExp

[shasharoman]

What kind of change does this PR introduce? (check at least one)

• Bugfix
• Feature
• Code style update
• Refactor
• Build-related changes
• Other, please describe:

Does this PR introduce a breaking change? (check one)

• Yes
• No

If yes, please describe the impact and migration path for existing applications:

The PR fulfills these requirements:

• It's submitted to the dev branch for v2.x (or to a previous version branch), not the master branch
• When resolving a specific issue, it's referenced in the PR's title (e.g. fix #xxx[,#xxx], where "xxx" is the issue number)
• All tests are passing: https://github.com/vuejs/vue/blob/dev/.github/CONTRIBUTING.md#development-setup
• New/updated tests are included

If adding a new feature, the PR's description includes:

• A convincing reason for adding this feature (to avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it)

Other information:
fixed #9781.

code explain:

const before = /^\s*((?:v-[\w-]+:|@|:|#)\[[^=]+\][^\s"'<>\/=]*)(?:\s*(=)\s*(?:"([^"]*)"+|'([^']*)'+|([^\s"'=<>`]+)))?/;
const after = /^\s*((?:v-[\w-]+:|@|:|#)\[[^=]+?\][^\s"'<>\/=]*)(?:\s*(=)\s*(?:"([^"]*)"+|'([^']*)'+|([^\s"'=<>`]+)))?/;

let s = ' #[foo]>foo</template><template #[bar]>bar</template>';

let beforeMatch = s.match(before);
let afterMatch = s.match(after);

console.log(beforeMatch[0]);     // '#[foo]>foo</template><template #[bar]'
console.log(afterMatch[0]);        // '#[foo]'

[posva]

Could you add a test for this?
You can add to the commit message body (not the first line) fixes #9785. That way, mergin this pr will automatically close the issue

[shasharoman]

Could you add a test for this?
You can add to the commit message body (not the first line) fixes #9785. That way, mergin this pr will automatically close the issue

A new test case for this has been included, and I will try use it(fixes #xxx) next time, thank you.

[tanasebutcaru]

I can confirm that this fixes #9781.
Thank you, @shasharoman!

[SimplyThomas]

@posva @yyx990803

Has there been any progress on this? I had to pin Vue to 2.6.9 until this gets released.

Thanks. :)

[davis90]

Hi everyone!

What new about this ? I still have the problem in 2.6.11 reproduce here