Program: 116872
Project: 116872
Buggy source:
public boolean Find(Scrib_proc_args args,Scrib_proc_rslt rslt){
  String text_str=args.Xstr_str_or_null(0);
  String regx=args.Pull_str(1);
  int bgn_char_idx=args.Cast_int_or(2,1);
  boolean plain=args.Cast_bool_or_n(3);
synchronized (surrogate_utl) {
    byte[] text_bry=Bry_.new_u8(text_str);
    int text_bry_len=text_bry.length;
    bgn_char_idx=Bgn_adjust(text_str,bgn_char_idx);
    int bgn_adj=surrogate_utl.Count_surrogates__char_idx(text_bry,text_bry_len,0,bgn_char_idx);
    int bgn_codepoint_idx=bgn_char_idx + bgn_adj;
    int bgn_byte_pos=surrogate_utl.Byte_pos();
    if (String_.Len_eq_0(regx))     return rslt.Init_many_objs(bgn_codepoint_idx + Scrib_lib_ustring.Base1,bgn_codepoint_idx + Scrib_lib_ustring.Base1 - 1);
    if (plain) {
      int pos=String_.FindFwd(text_str,regx,bgn_codepoint_idx);
      boolean found=pos != Bry_find_.Not_found;
      return found ? rslt.Init_many_objs(pos + Scrib_lib_ustring.Base1,pos + Scrib_lib_ustring.Base1 + String_.Len(regx) - Scrib_lib_ustring.End_adj) : rslt.Init_ary_empty();
    }
    regx=regx_converter.Parse(Bry_.new_u8(regx),Scrib_regx_converter.Anchor_G);
    Regx_adp regx_adp=Scrib_lib_ustring.RegxAdp_new_(core.Ctx(),regx);
    Regx_match[] regx_rslts=regx_adp.Match_all(text_str,bgn_codepoint_idx);
    int len=regx_rslts.length;
    if (len == 0)     return rslt.Init_ary_empty();
    List_adp tmp_list=List_adp_.New();
    Regx_match match=regx_rslts[0];
    int match_find_bgn_codepoint=match.Find_bgn();
    int match_find_bgn_adj=-surrogate_utl.Count_surrogates__codepoint_idx1(text_bry,text_bry_len,bgn_byte_pos,match_find_bgn_codepoint - bgn_codepoint_idx);
    tmp_list.Add(match_find_bgn_codepoint + match_find_bgn_adj + -bgn_adj+ Scrib_lib_ustring.Base1);
    tmp_list.Add(match.Find_end() + match_find_bgn_adj + -bgn_adj+ Scrib_lib_ustring.Base1 - Scrib_lib_ustring.End_adj);
    AddCapturesFromMatch(tmp_list,match,text_str,regx_converter.Capt_ary(),false);
    return rslt.Init_many_list(tmp_list);
  }
}

Fixed version (ground truth):
public boolean Find(Scrib_proc_args args,Scrib_proc_rslt rslt){
  String text_str=args.Xstr_str_or_null(0);
  String regx=args.Pull_str(1);
  int bgn_char_idx=args.Cast_int_or(2,1);
  boolean plain=args.Cast_bool_or_n(3);
synchronized (surrogate_utl) {
    byte[] text_bry=Bry_.new_u8(text_str);
    int text_bry_len=text_bry.length;
    bgn_char_idx=Bgn_adjust(text_str,bgn_char_idx);
    int bgn_adj=0;
    int bgn_codepoint_idx=bgn_char_idx + bgn_adj;
    int bgn_byte_pos=surrogate_utl.Byte_pos();
    if (String_.Len_eq_0(regx))     return rslt.Init_many_objs(bgn_codepoint_idx + Scrib_lib_ustring.Base1,bgn_codepoint_idx + Scrib_lib_ustring.Base1 - 1);
    if (plain) {
      int pos=String_.FindFwd(text_str,regx,bgn_codepoint_idx);
      boolean found=pos != Bry_find_.Not_found;
      return found ? rslt.Init_many_objs(pos + Scrib_lib_ustring.Base1,pos + Scrib_lib_ustring.Base1 + String_.Len(regx) - Scrib_lib_ustring.End_adj) : rslt.Init_ary_empty();
    }
    regx=regx_converter.Parse(Bry_.new_u8(regx),Scrib_regx_converter.Anchor_G);
    Regx_adp regx_adp=Scrib_lib_ustring.RegxAdp_new_(core.Ctx(),regx);
    Regx_match[] regx_rslts=regx_adp.Match_all(text_str,bgn_codepoint_idx);
    int len=regx_rslts.length;
    if (len == 0)     return rslt.Init_ary_empty();
    List_adp tmp_list=List_adp_.New();
    Regx_match match=regx_rslts[0];
    int match_find_bgn_codepoint=match.Find_bgn();
    int match_find_bgn_adj=-surrogate_utl.Count_surrogates__codepoint_idx1(text_bry,text_bry_len,bgn_byte_pos,match_find_bgn_codepoint - bgn_codepoint_idx);
    tmp_list.Add(match_find_bgn_codepoint + match_find_bgn_adj + -bgn_adj+ Scrib_lib_ustring.Base1);
    tmp_list.Add(match.Find_end() + match_find_bgn_adj + -bgn_adj+ Scrib_lib_ustring.Base1 - Scrib_lib_ustring.End_adj);
    AddCapturesFromMatch(tmp_list,match,text_str,regx_converter.Capt_ary(),false);
    return rslt.Init_many_list(tmp_list);
  }
}