Hi all,

I'm relatively new to perl and having some trouble with what I'd imagine is a classic issue for perl. I'd like to remove a list of email addresses in one file that appear in another.

In other words, given file removelist.txt, which contains:

user1@example.com
user2@example.com
user3@example.com
etc...

In some cases the lines may appear like this:

user1@example.com<mailto:user1@example.com>

due to bad HTML email clients. I'd like to remove all occurrences of each of the lines of the file from the file masterlist.txt, ignoring case.

I've played around with it a bit, but having trouble removing all at once, instead of iterating through the file and creating a temporary file for each email address in the removelist file.

I've also tried a combination of sed with egrep, but haven't figured out how to add a pipe character for the 'or' at the end of each line of the removelist.txt file except the last line.

Thanks for any ideas.

In reply to Removing users from a list by gossamer

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.