Support regex named capture groups

[Sam-Martin]

It looks like the regex parser doesn't currently support named capture groups.
If you specify one, e.g.

regex = new RegExp('(?<contextBefore>.*)', 'ig')

it will throw a SyntaxError: Invalid RegExp patterm: Quantifier has nothing to repeat, js engine: hermes
Is this intentional, or a bug?

[mhorowitz]

It's intentional. The list of features we target today is based on ES6 (the 2015 edition of the language specification): https://github.com/facebook/hermes/blob/master/doc/Features.md

Named capture groups were added in the 2018 edition. We expect to support newer versions of the spec, including this feature, in the future, but we don't have a roadmap for this yet. We would be happy see PRs to add support for newer features which people are interested in.

[aprilmintacpineda]

I just ran into this problem facebook/react-native#32453 but it's because of ansi-styles, any possible work arounds?

[bombillazo]

Hello, could this feature be considered for the hermes roadmap?

As more dependencies and libraries start incorporating named capture groups into their code, hermes will crash whenever it finds one of those deps. It is already occurring as discussed in chalk/ansi-styles#78 and chalk/ansi-styles#80.

Thanks.

[BBKolton]

I just ran into this problem facebook/react-native#32453 but it's because of ansi-styles, any possible work arounds?

I ran into this issue as well. If you're ending up here, facebook/react-native#32453 (comment) solved my problem. It would still be great if Hermes could support capture groups to the ES spec. Thanks!