Add Regex#capture_count

[Sija]

Adds missing method counterpart to Regex#name_table.

[Sija]

Friendly ping for a review /cc @bcardiff @asterite @jhass

[asterite]

Why is this needed?

[Sija]

@asterite It's needed in cases where you need to introspect the given regex, say for generating default values for all/some of the capture groups. Obviously not a very commonly used feature, but nevertheless practical and complementary to above-mentioned Regex#name_table, plus it's the only way to obtain this information and so it feels weird to monkey-patch already supported PCRE feature.

[asterite]

Thanks! I was just curious because it's not there in Ruby, so I wonder how people managed to workaround that.

[Sija]

Can this get a 2nd approval?

[asterite]

What is this in Ruby?

[Sija]

@asterite I don't there is a such thing.

[Fryguy]

Possibly because Ruby uses oniguruma and from what I can tell it doesn't have this method either?

EDIT: Seems this is closest to onig_number_of_captures ?

[straight-shoota]

Thanks @Sija