Visual Basic® Scripting Edition
|| Language Reference |
Returns the position of the first occurrence of one string within another.
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.
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.
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
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.
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