> > The reason this is opt-in in pcre2lib, is because the interpretation of > existing regexes may change. > This standard is being adopted in other languages too, also opt-in, for > example in JavaScript [1]. > To expose this functionality in PHP, we also have to make it opt-in via a > modifier. >
Hi Niels, I'm also very much in favor of adding it too. Thank you. In JavaScript, all current browsers seem to support[^1] it, and at least for Firefox, it even defaults[^2] to the `/v` flag for the HTML input `pattern` attribute. [^1]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/unicodeSets [^2]: https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Attributes/pattern
