Add support for (*VERB) about regex

[Hywan]

Thanks, we will work on it as soon as we have time! Do you need it in a project soon (just to help us prioritize)?

[unkind]

Luckily, I don't need to parse exactly this part. I just made some experiments with lexer based on (?|...) ("branch reset group"):

~
\G
(?|
    (?:[^",\r\n]+)(*MARK:token0)
    |
    (?:"[^"\\]*(?:\\.[^"\\]*)*")(*MARK:token1)
    |
    (?:,)(*MARK:token2)
    |
    (?:\r?\n)(*MARK:token3)
    |
    [\S\s](*MARK:error)
)
~Jx

I parsed only tokens' sub-patterns: (?:[^",\r\n]+), (?:"[^"\\]*(?:\\.[^"\\]*)*"), etc.
It required some time to reassemble regex string from modified AST, though.