named_captures() public

Returns a hash representing information about named captures of rxp.

A key of the hash is a name of the named captures. A value of the hash is an array which is list of indexes of corresponding named captures.

#=> {"foo"=>[1], "bar"=>[2]}

#=> {"foo"=>[1, 2]}

If there are no named captures, an empty hash is returned.

#=> {}
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