Instead of NOT(ISERROR(FIND(... you can use ISNUMBER(FIND(...

Check that BG1 only contains "M" and not "M " (i.e extra spaces in
there).

You wont actually get an empty field returned if BG1 does equal "M",
as your formula will return BG20. If BG20 is blank then your formula
will return 0.

Hope this helps.

Pete

On Dec 11, 10:58*am, "G.P.N.L. c.v.a." wrote:
I am looking for a way to find out whether a certain string does NOT appear
in another string.
In that case FIND will give an error.

I tried to bypass this by using NOT(ISERROR(...), but this doen't seem to
work.

I tried using NOT(ISERROR(FIND("10";$BG20;1)<0 to check if "10" is prsent
in BG20
in this formula :
=IF(AND( *condition 1; condition 2);
* * * IF( * * * * *$BG$1="M"; *$BG20;
* * * IF( *AND($BG$1="K";
* * * * * * * * * * * * * * *NOT(ISERROR(FIND("10";$BG20;1))));
$BG20;
* * * IF( *AND($BG$1="J";
* * * * * * * * * * * * * * *NOT(ISERROR(FIND("10";$BG20;1))));
$BG20)));
* * * * * ""
* * * * *)
but for BG1 = "M", I still get "FALSE" instaed of an empty field.

What am I doing wrong ?
Tx in advance,
Gilbert