Input file:
88,100,2287432,1,0,400,2287432,52,12, ^M
16,275,2287432,0,0041880118XF,,/ ^M
88,REMARK : STANDING INSTR FROM: 323-126065 ADT FLOAT XFER CREDIT ^M
16,469,207805,0,2348128762TC,,/ ^M

[download]
I'm trying to get rid of space before ^M, where ^M is a special character (it's one byte i.e ^M is one character) I'm using following code but its not working. Any suggestion please... Thanks. 
open (diff, "SAPPDAY.00063.new");
$count = 0;
while () {
    if (/(^16|^88)/) {
        chomp $_;
        @words = split(/,/, $_);
        $field_cnt = $#words;

        # print "  Field count = $field_cnt\n";

        $last_length = length $words[$field_cnt];

        # print "  Field length= $last_length\n";

        $num1 = $last_length-1;
        $num2 = $num - 1;

        # print " NUM 1 = [$num1]\n";

        if ( substr($words[$field_cnt], $num1, 1) eq " " ) {
            $part1 = substr($words[$field_cnt], 0, $num2 );
            $part2 = substr($words[$field_cnt], $last_length, 1);
            $words[$field_cnt] = $part1 . $part2;
            print "$words[$field_cnt]\n";
        }
        exit;
    }
}

[download]

[ar0n, super-hero by night]

In reply to Re: substring function by ar0n
in thread substring function by Anonymous Monk

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.