my @lines = <$fh>;                  # read whole file

foreach (0 .. $#lines)
{
    if ($lines[$_] =~ /$regex/)
    {
        printf "Match found on line %d\n", ($_ + 1);
        $match = 1;
    }
}

[download]

No need to read the whole file at once: 

while ( <$fh> )
{
    if ( /$regex/ )
    {
        print "Match found on line $.\n";
        $match = 1;
    }
}

[download]


This may solve your multi-line problem (UNTESTED): 

my $lines;
while ( <$fh> )
{
    $lines .= $_;
    if ( $lines =~ /($regex)/sm )
    {
        my $newlines = $1 =~ tr/\n//;
        if ( $newlines )
        {
            print "Match found on lines ", $. - $newlines, " through $
+.\n";
        }
        else
        {
            print "Match found on line $.\n";
        }
        $match = 1;
        $lines = $_;
    }
}

[download]

In reply to Re: Getting the line numbers of a multi-line match by jwkrahn
in thread Getting the line numbers of a multi-line match by Athanasius

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.