match_backref_number 1033 re.c               int i = match_backref_number(match, n);
match_backref_number 1069 re.c               int i = match_backref_number(match, n);
match_backref_number 1104 re.c               int i = match_backref_number(match, n);
match_backref_number 3337 re.c                   n = match_backref_number(match, nth);