Re: [w3ctag/design-reviews] TAG review of the proposal to use the RegExp `v` flag instead of `u` for the HTML `pattern` attribute (Issue #832)

From the same link:

> * **[BREAKING CHANGE]** Some previously valid patterns are now errors, specifically those with a character class including either an unescaped [special character](https://arai-a.github.io/ecma262-compare/snapshot.html?pr=2418#prod-ClassSetSyntaxCharacter) `(` `)` `[` `]` `{` `}` `/` `-` `\` `|` or [a double punctuator](https://arai-a.github.io/ecma262-compare/snapshot.html?pr=2418#prod-ClassSetReservedDoublePunctuator):

Do you have any sense of how common these patterns are in the wild?

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