StringScanner#captures

captures

static VALUE
strscan_captures(VALUE self)
{
    struct strscanner *p;
    int   i, num_regs;
    VALUE new_ary;

    GET_SCANNER(self, p);
    if (! MATCHED_P(p))        return Qnil;

    num_regs = p->regs.num_regs;
    new_ary  = rb_ary_new2(num_regs);

    for (i = 1; i < num_regs; i++) {
        VALUE str = extract_range(p,
                                  adjust_register_position(p, p->regs.beg[i]),
                                  adjust_register_position(p, p->regs.end[i]));
        rb_ary_push(new_ary, str);
    }

    return new_ary;
}

Returns the subgroups in the most recent match (not including the full match). If nothing was priorly matched, it returns nil.

Example

s = StringScanner.new("Fri Dec 12 1975 14:39")
s.scan(/(\w+) (\w+) (\d+) /)       # -> "Fri Dec 12 "
s.captures                         # -> ["Fri", "Dec", "12"]
s.scan(/(\w+) (\w+) (\d+) /)       # -> nil
s.captures                         # -> nil

See also #beginning_of_line? #charpos #[] #check also in 4.1 · 4.0 · 3.4 · 3.2 · 3.1 · 3.0

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