Support for v (unicodeSets) and d (hasIndices) flags

[lionel-rowe]

• v flag (unicodeSets)

  RegExp.prototype.unicodeSets has the value true if the v flag was used; otherwise, false. The v flag is an "upgrade" to the u flag that enables more Unicode-related features. ("v" is the next letter after "u" in the alphabet.) Because u and v interpret the same regex in incompatible ways, using both flags results in a SyntaxError.

  Browser support: widespread in evergreen browsers, latest NodeJS, Deno

• d flag (hasIndices)

  RegExp.prototype.hasIndices has the value true if the d flag was used; otherwise, false. The d flag indicates that the result of a regular expression match should contain the start and end indices of the substrings of each capture group. It does not change the regex's interpretation or matching behavior in any way, but only provides additional information in the matching result.

  Browser support: universal in evergreen browsers, NodeJS LTS, Deno

[Unique-Pixels]

Came here to make an issue on this. +1

Note that the v flag is used by the browsers when compiling the pattern attribute on forms, so it is really a needed flag.

[Ivokato]

Just ran into this while fixing our signup flow. It would have been good to debug our outdated email validation pattern so +1

[lionel-rowe]

@gskinner @wdamien if someone hypothetically were to make a PR adding v flag support, what are the chances of it getting merged and deployed in the near future?