pre_match()
public
Returns the portion of the original string before the current match.
Equivalent to the special variable $`.
m = /(.)(.)(\d+)(\d)/.match("THX1138.")
m.pre_match
VALUE
rb_reg_match_pre(VALUE match)
{
VALUE str;
struct re_registers *regs;
if (NIL_P(match)) return Qnil;
match_check(match);
regs = RMATCH_REGS(match);
if (BEG(0) == -1) return Qnil;
str = rb_str_subseq(RMATCH(match)->str, 0, BEG(0));
if (OBJ_TAINTED(match)) OBJ_TAINT(str);
return str;
}