i guess this would depend on the size of your CSV; but, would it be silly to do it backwards? that is: open the CSV for in-place editing; for each line run an m// and if you find the file $_ .= 'addition'; #?
Snippets of code should be wrapped in
<code> tags not<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor