instance method

Regexp#names

() -> ::Array[::String]

names → array_of_names

static VALUE
rb_reg_names(VALUE re)
{
    VALUE ary;
    rb_reg_check(re);
    ary = rb_ary_new_capa(onig_number_of_names(RREGEXP_PTR(re)));
    onig_foreach_name(RREGEXP_PTR(re), reg_names_iter, (void*)ary);
    return ary;
}

Returns an array of names of captures (see Named Captures):

Example

/(?<foo>.)(?<bar>.)(?<baz>.)/.names # => ["foo", "bar", "baz"]
/(?<foo>.)(?<foo>.)/.names          # => ["foo"]
/(.)(.)/.names                      # => []

See also #named_captures #options #match? #source also in 4.1 · 3.4 · 3.3 · 3.2 · 3.1 · 3.0

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