Method: MatchData#names

Defined in:
re.c

#names ⇒ Object

Returns an array of the capture names (see Named Captures):

m = /(?<foo>.)(?<bar>.)(?<baz>.)/.match("hoge")
# => #<MatchData "hog" foo:"h" bar:"o" baz:"g">
m.names # => ["foo", "bar", "baz"]

m = /foo/.match('foo') # => #<MatchData "foo">
m.names # => [] # No named captures.

Equivalent to:

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



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# File 're.c', line 1162

static VALUE
match_names(VALUE match)
{
    match_check(match);
    if (NIL_P(RMATCH(match)->regexp))
        return rb_ary_new_capa(0);
    return rb_reg_names(RMATCH(match)->regexp);
}