how to make sense of expression logic in ssis

Question

I am working on a SSIS project that involves unzipping a folder which when extracted contains multiple text files in the same directory using a ForEachLoop Container. each file will have a different Name.

I have two variables of which variable 2 has an expression

Variable 1
name = zipfileName 
Value= sample.zip

variable 2
name = FileName 
value = *.* 
Expression = REPLACE(@[User::ZipFileName],".zip",".txt")

I need clarification concerning the expression part

My thinking is that this expression means the name of the zipfile is replaced with .txt extension when extracted? I also would like to know how it dynamically changes fileNames in runtime seeing as there are multiple files

thanks

Answer 1

From what I can see, the Expression is replacing .zip for .txt in [User::ZipFileName]

If the value of [User::ZipFileName] is somefile.zip

the output would be:

somefile.txt