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Thread: where is help for functions?
2001-01-09, 19:35 #1jwahlgrenGuest
where is help for functions?
I'm trying to split a text field into two. I'm building an expression and trying to find help on the syntax of text functions. The only function I can find that seems to help is InStr but if I open help then I can find a function called SEARCH. SEARCH doesn't work (undefined) and I need some examples of InStr because the syntax description needs explanation. Where is the help on what text functions are available in ACCESS 2000 9.0.2720 with some examples maybe and certainly syntax?
2001-01-10, 13:48 #2
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Re: where is help for functions?
Here is the help for the function from Access 97. I was not able to find more help in Access 2000 than what you had mentioned.
I am also including the example from the Access97 help file.
Returns a Variant (Long) specifying the position of the first occurrence of one string within another.
InStr([start, ]string1, string2[, compare])
The InStr function syntax has these arguments:
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 sought.
compare Optional. Specifies the type of string comparison. The compare argument can be omitted, or it can be 0, 1or 2. Specify 0 (default) to perform a binary comparison. Specify 1 to perform a textual, noncase-sensitive comparison. For Microsoft Access only, specify 2 to perform a comparison based on information contained in your database. If compare is Null, an error occurs. If compare is omitted, the Option Compare setting determines the type of comparison.
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
start > string2 0
The InStrB function is used 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.
Instr function example
This example uses the InStr function to return the position of the first occurrence of one string within another.
Dim SearchString, SearchChar, MyPos
SearchString ="XXpXXpXXPXXP" ' String to search in.
SearchChar = "P" ' Search for "P".
' A textual comparison starting at position 4. Returns 6.
MyPos = Instr(4, SearchString, SearchChar, 1)
' A binary comparison starting at position 1. Returns 9.
MyPos = Instr(1, SearchString, SearchChar, 0)
' Comparison is binary by default (last argument is omitted).
MyPos = Instr(SearchString, SearchChar) ' Returns 9.
MyPos = Instr(1, SearchString, "W") ' Returns 0.
Hope this helps.