Difference between Instr and InstrRev

InStrRev:

The InStrRev Function returns the first occurrence of one string within another string. The Search happens from right to Left.

Syntax:

InStrRev(string1,string2[,start[,compare]])

Example:
 str = "abcdeabcde"

MsgBox InStrrev(str, "e")   ' search from end, , will return 10


InStr:

The InStr Function returns the first occurrence of one string within another string. The search happens from left to right.

Syntax:

InStr([start,]string1,string2[,compare])


Example:

 str = "abcdeabcde"

MsgBox InStr(str, "e") ' search from start, will return 5