When running a For Each Loop through a set of files, sometimes you will have specific files that you do not want to load.

For example, I have a set of files named:

Abc.txt
Mno.txt
Rts.txt
Wln.txt
Xyz.txt

If I want to skip the file that starts with “W” then I will need an expression in my For Each Loop to detect this file.

Inside the For Each loop I am going to place a sequence container. This will give me a place to anchor my expression which I will place on the precedence constraint coming from the sequence container. There are no tasks in the sequence container.

On the precedence constraint line I am going to set it to constraint and expression. The expression will be:

substring(Upper(@strFileName),1,1) != “W”

This is looking at the first letter in the filename and comparing it to the letter “W”. I would place the “W” in a variable and use that instead, I am just showing this way for simplicity. Notice I convert the file name variable to upper case and compare it to an uppercase “W”. That way the case will not matter.