VBScript InStrRev Function
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The InStrRev function returns the position of the first occurrence of one string within another. The search begins from the end of string, but the position returned counts from the beginning of the string.
The InStrRev function can return the following values:
- If string1 is "" - InStrRev returns 0
- If string1 is Null - InStrRev returns Null
- If string2 is "" - InStrRev returns start
- If string2 is Null - InStrRev returns Null
- If string2 is not found - InStrRev returns 0
- If string2 is found within string1 - InStrRev returns the position at which match is found
- If start > Len(string1) - InStrRev returns 0
Tip: Also look at the InStr function
Syntax
InStrRev(string1,string2[,start[,compare]])
| Parameter | Description |
|---|---|
| string1 | Required. The string to be searched |
| string2 | Required. The string expression to search for |
| start | Optional. Specifies the starting position for each search. The search begins at the last character position by default (-1) |
| compare | Optional. Specifies the string comparison to use.
Default is 0 Can have one of the following values:
|
Examples
Example 1
<%
txt="This is a beautiful day!"
response.write(InStrRev(txt,"beautiful"))
%>
The output of the code above will be:
11
Show Example »
Example 2
Finding the letter "i", using different starting positions:
<%
txt="This is a beautiful day!"
response.write(InStrRev(txt,"i",-1) & "<br />")
response.write(InStrRev(txt,"i",7) & "<br />")
%>
The output of the code above will be:
16
6
Show Example »
Example 3
Finding the letter "T", with textual, and binary, comparison:
<%
txt="This is a beautiful day!"
response.write(InStrRev(txt,"T",-1,1) & "<br />")
response.write(InStrRev(txt,"T",-1,0) & "<br />")
%>
The output of the code above will be:
15
1
Show Example »
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