End of Life Ruby 3.1 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →
instance method
StringScanner#values_at
scanner.values_at( i1, i2, ... iN ) → an_array
ext/strscan/strscan.c
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static VALUE
strscan_values_at(int argc, VALUE *argv, VALUE self)
{
struct strscanner *p;
long i;
VALUE new_ary;
GET_SCANNER(self, p);
if (! MATCHED_P(p)) return Qnil;
new_ary = rb_ary_new2(argc);
for (i = 0; i<argc; i++) {
rb_ary_push(new_ary, strscan_aref(self, argv[i]));
}
return new_ary;
}
Returns the subgroups in the most recent match at the given indices. 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.values_at 0, -1, 5, 2 # -> ["Fri Dec 12 ", "12", nil, "Dec"] s.scan(/(\w+) (\w+) (\d+) /) # -> nil s.values_at 0, -1, 5, 2 # -> nil