Perl, Ruby and .NET all allow multiple named capturing groups to share the same name in the regular expression. As of 07.2018, current implementations of named capturing groups in browsers (I've checked it in Chrome 67 and FF 61) don't allow this. So this regular expression for strict date analyze is invalid:

var dateRegExp = /^(?:(?<month>0?2)\/(?<day>[12][0-9]|0?[1-9])|(?<month>0?[469]|11)\/(?<day>30|[12][0-9]|0?[1-9])|(?<month>0?[13578]|1[02])\/(?<day>3[01]|[12][0-9]|0?[1-9]))\/(?<year>(?:[0-9]{2})?[0-9]{2})$/

Do you consider to add support for multiple named capturing groups?
I think it may help a lot. If we started to implement it as it in the other languages why don't implement it
thoroughly with all the features available?