That can delete too many lines. 

01 keep 
02 keep        <- gets discarded by your code.
03 keep        <- gets discarded by your code.
04 keep        <- gets discarded by your code.
05 keep        <- gets discarded by your code.
06 keep        <- gets discarded by your code.
07 discard B5
08 discard B4
09 discard B3
10 discard B2
11 discard B1
12 somepat
13 somepat

[download]

That's in addition to the problems with $.-5 going negative.

By the way, splice would be more efficient than delete since it wouldn't shrink the allocated buffer.

I'm also trying to get the (-d) to be a stand-alone flag. What would be the best approach to this?

    'd!'      => \$delete,

[download]

-c ./someconfile

That's weird. Why not just print to STDOUT and redirect output? It's way more flexible at no cost. 

perl dellines.pl -i somepat -d > someconfile

[download]

The name of the option doesn't even make sense. It's an output file, not a config file as far as the tool is concerned.

In reply to Re^3: Regex question by ikegami
in thread Regex question by jamsda

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.