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Microsoft® Visual Basic® Scripting Edition
InStr Function
Language Reference |

See Also


Description
Returns the position of the first occurrence of one string within another.

Syntax
InStr([start, ]string1, string2[, compare])

Look for string2 inside string1. The InStr function syntax has these arguments:

Part Description
start Optional. Numeric expression that sets the starting position for each search. If omitted, search begins at the first character position. If start contains Null, an error occurs. The start argument is required if compare is specified.
string1 Required. String expression being searched.
string2 Required. String expression searched for.
compare Optional. Numeric value indicating the kind of comparison to use when evaluating substrings. See Settings section for values. If omitted, a binary comparison is performed.

Settings
The compare argument can have the following values:

Constant Value Description
vbBinaryCompare 0 Perform a binary comparison. This means it IS case sensitive
vbTextCompare 1 Perform a textual comparison. This means it is NOT case sensitive
vbDatabaseCompare 2 Perform a comparison based upon information contained in the database where the comparison is to be performed.
Return Values
The Instr function returns the following values:

If InStr returns
string1 is zero-length 0
string1 is Null Null
string2 is zero-length start
string2 is Null Null
string2 is not found 0
string2 is found within string1 Position at which match is found. The first character is position 1.
start > Len(string2) 0
Remarks


Note  Another function (InStrB) is provided for use with byte data contained in a string. Instead of returning the character position of the first occurrence of one string within another, InStrB returns the byte position.



© 1996 by Microsoft Corporation.

Questions:

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