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