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
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InStr([start,]string1,string2[,compare])
|
| Parameter |
Description |
| start |
Optional. Specifies the starting
position for each search. The search begins at the first character
position 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
|
Example 1
Dim txt,pos
txt="This is a beautiful day!"
pos=InStr(txt,"his")
document.write(pos)
Output:
2
|
Example 2
Dim txt,pos
txt="This is a beautiful day!"
'A textual comparison starting at position 4
pos=InStr(4,txt,"is",1)
document.write(pos)
Output:
6
|
Example 3
Dim txt,pos
txt="This is a beautiful day!"
'A binary comparison starting at position 1
pos=InStr(1,txt,"B",0)
document.write(pos)
Output:
0
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