VBScript InStr Function

Quiz

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])

Description

Start, an Optional Parameter. Specifies the starting position for the search. The search begins at the first position from left to right.
String1, a Required Parameter. String to be searched.
String2, a Required Parameter. String against which String1 is searched.
Compare, an Optional Parameter. Specifies the String Comparison to be used. It can take the below mentioned values −
- 0 = vbBinaryCompare - Performs Binary Comparison(Default)
- 1 = vbTextCompare - Performs Text Comparison

Example

<!DOCTYPE html>
<html>
   <body>
      <script language = "vbscript" type = "text/vbscript">
         var = "Microsoft VBScript"
         document.write("Line 1 : " & InStr(1,var,"s") & "<br />")
         document.write("Line 2 : " & InStr(7,var,"s") & "<br />")
         document.write("Line 3 : " & InStr(1,var,"f",1) & "<br />")
         document.write("Line 4 : " & InStr(1,var,"t",0) & "<br />")
         document.write("Line 5 : " & InStr(1,var,"i") & "<br />")
         document.write("Line 6 : " & InStr(7,var,"i") & "<br />")
         document.write("Line 7 : " & InStr(var,"VB"))
      </script>
   </body>
</html>

When you save it as .html and execute it in Internet Explorer, then the above script will produce the following result −

Line 1 : 6
Line 2 : 0
Line 3 : 8
Line 4 : 9
Line 5 : 2
Line 6 : 16
Line 7 : 11

vbscript_strings.htm

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