Oracle Split character ____oracle

Create or Replace function Get_strarraystrofindex
(
Av_str varchar2,--string to be split
Av_split varchar2,--Separator symbol
Av_index number--take the first few elements
)
return VARCHAR2
Is
LV_STR VARCHAR2 (1024);
Lv_strofindex VARCHAR2 (1024);
Lv_length number;
Begin
Lv_str:=ltrim (RTrim (AV_STR));
Lv_str:=concat (Lv_str,av_split);
Lv_length:=av_index;
If Lv_length=0 Then
Lv_strofindex:=substr (Lv_str,1,instr (lv_str,av_split)-length (av_split));
Else
lv_length:=av_index+1;
Lv_strofindex:=substr (Lv_str,instr (Lv_str,av_split,1,av_index) +length (Av_split), InStr (Lv_str,av_split,1,lv_ Length)-instr (Lv_str,av_split,1,av_index)-length (av_split));
End If;
return lv_strofindex;
End Get_strarraystrofindex;