A few remarks:

• quotemeta, using "\Q" inside the regex (see also perlop), to search for literal substrings instead of a pattern
• Do not put extra quotes in your substitution pattern, it'll cause it to fail
• There's no need to match and substitute in two steps. s/// will just return a true flag if it indeed did substitute anything, and do nothing otherwise
• Anchor the match to the beginning of the string, using ^, or you'll allow it to substitute anywhere in the string — unless that's what you want?

The resulting code is:

if($folder_path =~ s/^\Q$sourcedir/Eitv9/) {
            print "\n$folder_path/$file";}
[download]

Oh and if the path comes from the user using STDIN, don't forget to chomp it first.

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