Hello Perl Monks!

I'm struggling with multi line matches, hoping someone can offer advice.

I have text files with data that looks like this:
123,-->456,
456,-->234,
234,-->789,
789,-->123,

I am trying to print the first three digits of the each line followed by the second three digits of the following line to my OUTFILE on a single line. So the output for the four lines above would be:
123,-->234,
456,-->789,
234,-->123,

From what I've been reading I need to use the /s or /m modifier to match a newline. I've been trying to use /s to have "." match a newline. My code looks like this:

@files=glob"SBNUM_*.txt";


open OUTFILE, ">v2test.txt" or die "Could not create outfile!";


foreach $ARG(@files){

open INFILE, "<$ARG" or die "CANNOTOPENINFILE";


while (<INFILE>)
 

{

    if (m/^(\d\d\d),-->(\d\d\d),.(\d\d\d),-->(\d\d\d),/s) 
    
    {

    
    print OUTFILE "\n$1,-->$4,";

    }

    
}
}

[download]

I have tried a few variations but so far nothing works for me. Any advice or suggestions are greatly appreciated!

TJ

In reply to Multi Line Regex Matches... by tj999

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.