InstrRev - function of language VBScript

Description:

Returns the position of an occurrence of one string within another, from the end of string.

Syntax:

Integer InstrRev(String string1, String string2, [Integer start], [Integer compare])

Parameters:

string1	(String) Text string being searched
string2	(String) Text string searched for
start	[optional](Integer) Numeric expression that sets the starting position for each search. If not set, then -1 is used (it means that the search begins at the last character position).
compare	[optional](Integer) Numeric value indicating the kind of comparison to use when evaluating substrings. If not set, then a binary comparison is performed. vbBinaryCompare - perform a binary comparison vbTextCompare - perform a textual comparison

Return values:

0 - string1 is zero-length or string2 is not found or start > Len(string2)

Null - string1 or string2=Null

start - string2 is zero-length

position at which match is found - string2 is found within string1

Note:

The syntax for this function is not the same as the syntax for the InStr function.

Example:

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Dim SearchString, SearchChar, nPos

SearchString = "XXpXXpXXPXXP"

SearchChar = "P"

nPos = InstrRev(SearchString, SearchChar, 10, 0)
  ' a binary comparison starting at position 10, returns 9

nPos = InstrRev(SearchString, SearchChar, -1, 1)
  ' a textual comparison starting at the last position, returns 12

nPos = InstrRev(SearchString, SearchChar, 8)
  ' a binary comparison, returns 0