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Ruby latest stable (v2_5_5) - 0 notes - Class: MatchData

[](p1, p2 = v2) public

Match Reference – MatchData acts as an array, and may be accessed using the normal array indexing techniques. mtch[0] is equivalent to the special variable $&, and returns the entire matched string. mtch[1], mtch[2], and so on return the values of the matched backreferences (portions of the pattern between parentheses).

m = /(.)(.)(\d+)(\d)/.match("THX1138.")
m          #=> #<MatchData "HX1138" 1:"H" 2:"X" 3:"113" 4:"8">
m[0]       #=> "HX1138"
m[1, 2]    #=> ["H", "X"]
m[1..3]    #=> ["H", "X", "113"]
m[-3, 2]   #=> ["X", "113"]

m = /(?<foo>a+)b/.match("ccaaab")
m          #=> #<MatchData "aaab" foo:"aaa">
m["foo"]   #=> "aaa"
m[:foo]    #=> "aaa"

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static VALUE
match_aref(int argc, VALUE *argv, VALUE match)
{
    VALUE idx, length;

    match_check(match);
    rb_scan_args(argc, argv, "11", &idx, &length);

    if (NIL_P(length)) {
        if (FIXNUM_P(idx)) {
            return rb_reg_nth_match(FIX2INT(idx), match);
        }
        else {
            int num = namev_to_backref_number(RMATCH_REGS(match), RMATCH(match)->regexp, idx);
            if (num >= 0) {
                return rb_reg_nth_match(num, match);
            }
            else {
                return match_ary_aref(match, idx, Qnil);
            }
        }
    }
    else {
        long beg = NUM2LONG(idx);
        long len = NUM2LONG(length);
        long num_regs = RMATCH_REGS(match)->num_regs;
        if (len < 0) {
            return Qnil;
        }
        if (beg < 0) {
            beg += num_regs;
            if (beg < 0) return Qnil;
        }
        else if (beg > num_regs) {
            return Qnil;
        }
        else if (beg+len > num_regs) {
            len = num_regs - beg;
        }
        return match_ary_subseq(match, beg, len, Qnil);
    }
}

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