End of Life Ruby 3.1 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →
instance method
Regexp#named_captures
rxp.named_captures → hash
re.c
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static VALUE
rb_reg_named_captures(VALUE re)
{
regex_t *reg = (rb_reg_check(re), RREGEXP_PTR(re));
VALUE hash = rb_hash_new_with_size(onig_number_of_names(reg));
onig_foreach_name(reg, reg_named_captures_iter, (void*)hash);
return hash;
}
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.
Example
/(?<foo>.)(?<bar>.)/.named_captures #=> {"foo"=>[1], "bar"=>[2]} /(?<foo>.)(?<foo>.)/.named_captures #=> {"foo"=>[1, 2]}
If there are no named captures, an empty hash is returned.
Example
/(.)(.)/.named_captures #=> {}